Topic: identities list of topics
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17 items are filed under this topic.

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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 x Answered by Robert Dawson and Penny Nom.
	A trig identity		2012-01-08
		From Joe: Prove this Trig. Identity : ((cos2θ + sinθ-1) / tanθ ) + sin2θ = cosθ Answered 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 pleease Answered 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 x Answered 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) x Answered 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 2theta Answered 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 Suzanne Answered 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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