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 Topic: trig identity
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 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 = cosθAnswered 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 pleeaseAnswered 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^2xAnswered 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)? RegardsAnswered by Harley Weston. cos3A=-1/3 find cos6A 2008-05-15 From mike:cos3A=-1/3 find cos6AAnswered 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         sinxAnswered 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 xAnswered by Steve La Rocque. tan1/2x + cot1/2x = 2cscx 2006-11-04 From Jazmin:Prove tan1/2x + cot1/2x = 2cscxAnswered 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 = sinxcosxAnswered 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) -1Answered 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/secxAnswered 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+tanxAnswered 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 tan(x)=csc2(x)-cot2(x) cos(x)/csc(x)-2sin(x)=tan(x)/1-tan(x) 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.

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