.
.
Math Central - mathcentral.uregina.ca
Quandaries & Queries
Q & Q
. .
topic card  

Topic:

trig identity

list of
topics
. .
start over

34 items are filed under this topic.
 
Page
1/1
A trig identity 2015-10-28
From Gail:
verify sec(x) =cot(x)+tan(x)/csc(x), the csc(x) is under both the whole term cot(x) + tan(x)
Answered by Penny Nom.
A trig identity 2013-01-04
From Tehmas:
Prove sinC+sinD=2sin(C+D/2)cos(C-D/2)
Answered by Harley Weston.
A trig identity 2012-01-08
From Joe:
Prove this Trig. Identity :

((cos2θ + sinθ-1) / tanθ ) + sin2θ = cosθ

Answered by Penny Nom.
Tan(x+pi)-tan(pi-x)=2tan(x). 2011-01-09
From Steven:
Verify the identity:
Tan(x+pi)-tan(pi-x)=2tan(x)

Answered by Penny Nom.
A trig identity 2010-01-05
From Christine:
I need help with this whole paper here is one problem

csc^2x-cot^2x/1-sin^2x=sec^2x
by the ^2 i mean squared pleease

Answered by Penny Nom.
A trig identity 2009-07-10
From sam:
I need to prove:

tan x (cot x + tan x) = sec2 x
(the "sec2" is "sec squared")

I am totally stuck!!
Thanks!

Answered by Stephen La Rocque and Harley Weston.
Sec(2x) 2008-11-23
From Evan:
Prove that this is an identity...

sec2x = sec^2x / 2 - sec^2x

Answered by Harley Weston.
A trig Identity 2008-11-13
From Rebecca:
Question from Rebecca, a student:

How do I prove:

     1/sin@                csc@                -2sin@
________      +       ______       =    _____
1 + CSC@         1-1/sin@                 cos^@
Answered by Penny Nom.

A trig identity 2008-11-03
From Student:
verify cos(2x)=(cot(x)-tan(x))/(cot(x)+tan(x))
Answered by Penny Nom.
TRIG IDENTITIES 2008-08-17
From VINCE:
HOW DO YOU SIMPLIFY THE FOLLOWING:- 2sin3(theta)cos3(theta)? Regards
Answered by Harley Weston.
cos3A=-1/3 find cos6A 2008-05-15
From mike:
cos3A=-1/3 find cos6A
Answered by Penny Nom.
(1-tanx) / (1+tanx) = (1-sin2x) / cos2x 2008-02-14
From isaiah:
i'm having trouble proving 1-tanx / 1+tanx = 1-sin2x / cos2x, can anyone help me from going crazy?
Answered by Penny Nom.
A trig identity 2007-11-10
From James:
I need to prove trig identities, and I can't figure this one out

1 + sinx - cosx         1 - cosx
-------------------- = -------------
1 + sinx + cosx         sinx

Answered by Chris Fisher.
A trig identity 2006-12-14
From Zamira:
i need help with this proof: ((cot(x)-tan(x))/ cot(x) + tan(x)) = cos (x)
Answered by Penny Nom.
Sin 2x / 1-Cos 2x = 2 Csc 2x - Tan x 2006-12-06
From Mark:
I need to prove the following:
Sin 2x / 1-Cos 2x = 2 Csc 2x - Tan x

Answered by Steve La Rocque.
tan1/2x + cot1/2x = 2cscx 2006-11-04
From Jazmin:
Prove tan1/2x + cot1/2x = 2cscx
Answered by Penny Nom.
A trig identity 2006-06-04
From Courtney:
Show that this equation is an identity: (sin x + sin 2X)/(cos x - cos 2x) = cot(x/2)
Answered by Stephen La Rocque.
A trig identity 2006-03-28
From Iqbal:
Could you please prove,

[tan(x)-sin(x)]/sin3(x)=sec(x)/[1+cos(x)]
Answered by Stephen La Rocque.

A pair of trig equations 2005-12-05
From Kevin:

I am trying to solve for A and B but haven't been able to find a trig identity that will help me.

1.414 = .5cosA + cosB
.5 = .5sinA - sinB

how do I solve this?


Answered by Penny Nom.
A trig identity 2005-03-06
From Patrick:
im trying to verify this identity:

sin(x)+sin(5x)
-------------------- = tan(3x)
cos(x)+cos(5x)


Answered by Chris Fisher.
A trig identity 2003-05-20
From Patty:
Please help with the following

1/ tanx + cotx = sinxcosx

Answered by Penny Nom.
A trig identity 2003-02-22
From Ron:
We have spent hours trying to solve the following identity without success. Can you give us some hints as to how it is done?

1 + tan(x) tan(2x) = tan(2x) cot(x) -1

Answered by Penny Nom.
An identity? 2002-10-27
From Jenna:
I can't prove
 
1-sinQ     1 ---- = tanQ + --- 1+sinQ      cosQ 

Answered by Penny Nom.
An identity(?) 2002-05-02
From A student:
prove identity sin 2x/1-sinx= secx+1/secx


Answered by Paul Betts.
A trigonometric identity 2002-03-22
From Debby:
I am stuck on a problem and wondering if you can help?? It is: Prove the following:
sec2(X)+csc2(X) = sec2(X)csc2(X)

Answered by Harley Weston.
A trig identity 2001-07-27
From Jeff:
prove this identity and show steps
tan(x/2+pi/4)=secx+tanx

Answered by Harley Weston.
Trig identity crisis 2000-11-29
From Rhiannon:
I have tried many times to find the answer to these problems but I can't I am in grade 12
  1. tan(x)=csc2(x)-cot2(x)
  2. cos(x)/csc(x)-2sin(x)=tan(x)/1-tan(x)
  3. cos(x)[ tan2(x)1-1]/cos2(x)+sin2(x)=sec(x)

Answered by Harley Weston.
A trigonmetric identity 2000-05-15
From Caitlin:
My name is Caitlin and my question is from 11th grade math and I'm a student

my question is I need to solve this identity :

cos x csc x - sin x sec x = 2 cot 2x


Answered by Paul Betts.
A trig identiry 2000-02-23
From Ashlee:
I am having problems doing this problem. Can you help?

Verify the identity: (1+cot2X)(1-cos2X)=2


Answered by Harley Weston.
A trig identity 2000-02-17
From Eric:

Question:
How do I solve this problem?

 sin3x   cos3x _____ - _____ = 2 sinx cosx 

Answered by Chris Fisher.
Proving a trigonometric identitiy 1999-12-17
From Ryan:
I need to figure out how to prove that sec2x + csc2x = sec2x csc2x. I am not sure where to start out with it and whether I should use reciprocal, quotient, or pythagorean.
Answered by Penny Nom.
A trig problem 1999-06-03
From Stu Barnes:
cos(theta) / 1+ sin(theta)=sec(theta)-tan(theta)

I've being having trouble with this one on my correspondance course.
Answered by Harley Weston.

A trig identity 1996-03-11
From Azmat Hussain:
Is there an easier/another way to prove the trig identity cos(a+b) = cos(a)cos(b)-sin(a)sin(b)?
Answered by Penny Nom.
Trig identities 1995-11-30
From Azmat:
Why do we work on the two sides of a trig identity separately?
Answered by Harley Weston.
 
Page
1/1

 

 


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.

CMS
.

 

Home Resource Room Home Resource Room Quandaries and Queries Mathematics with a Human Face About Math Central Problem of the Month Math Beyond School Outreach Activities Teacher's Bulletin Board Canadian Mathematical Society University of Regina PIMS