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Quandaries & Queries
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 Topic: identities
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 1 + cot x divided by sin x + cos x 2015-01-15 From Torrie:I need to solve this problem in terms of Sin, but I'm having trouble. 1 + cot x divided by sin x + cos xAnswered by Robert Dawson and Penny Nom. A trig identity 2012-01-08 From Joe:Prove this Trig. Identity : ((cos2θ + sinθ-1) / tanθ ) + sin2θ = cosθAnswered by Penny Nom. A trig identity 2010-01-24 From Natalie:hi, i need help proving the following trig identity. i cant seem to figure out how to do it. thanks so much. (1+sin2x)/cos2x = cos2x/(1-sin2x)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. sin x / 1+ cos x = csc x - cot x 2009-11-18 From Mansi:i need a hint on how i could prove the following identity: sin x / 1+ cos x = csc x - cot xAnswered by Harley Weston. Trig identities 2009-01-05 From Michael:1) Determine if the following is an identity. If it is, prove it, If it isn't state it. tan x + cot x = sec x * csc x and 1 - (cos^2) x = 1+ (cot^2) xAnswered by Robert Dawson and Harley Weston. 2 tan theta /(1 + tan^2 theta) = sin 2theta 2008-03-25 From Charmaine:I'm having trouble on where to begin proving identities. I must prove that (2 tan theta / 1 + tan^2 theta) = sin 2thetaAnswered by Penny Nom. Trig identities 2007-07-30 From Suzanne:I'm a UR University Graduate (with High honours!) but not in math: I'm taking GeoTrig, Sk Learning version, and the text is poorly written. But I was flying through the material until I hit the Trig Identities. I just don't get WHY we have them, why we should know them? What good is this "theory". All that "simplying" rarely yeilds a simple-er version! Also, give me advice for how to study them. Thanks SuzanneAnswered by Harley Weston. Trig identities 2007-07-05 From Alex:Use the identities tan_=sin_/cos_ and/or sin*_+cos*_=1 to simplify 1-cos*_Answered by Stephen La Rocque. Two trig questions 2006-04-04 From mandy:I have a few questions that I need help with for my precal class in college. The following have to prove the trigonometric identities: cos4x + 2cos2x sin2x + sin4x = 1 sin4x - cos4x = 1 - 2cos2x thanks you,Answered by Stephen La Rocque. cos(3X) 2006-03-29 From Joshua:I'm having trouble proving that cos(3X)=cos3X -(cosX)(sin2 X)Answered by Penny Nom. 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. Some trig expressions 2004-05-23 From A student:Prove: sin A + sin B = 2sin(A+B/2)cos(A-B/2) cos A - cos B = -2sin(A+B/2)sin(A-B/2) cos A + cos B = 2cos(A+B/2)cos(A-B/2) sin A - sin B = 2cos(A+B/2)sin(A+B/2)Answered by Penny Nom. An identity in trigonometry 2002-10-17 From Alex:I really need help with proving this identity. (1+cosx+sinx)/(1+cosx-sinx) = secx + tanx Answered by Penny Nom. 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. 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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