trigonometric identities proof questions

Prove This Trig Identity? - Yahoo! Answers.

Jan 21, 2012. Suppose that you have to prove the trig identity: $$frac{sintheta - sin^3theta}{ cos^2theta}=sintheta$$. I have always been told that I should.
Types of questions. Prove Trigonometric Identities; Simplify Trigonometric expressions to sketch curve; Solve Trigonometric Equations; Use Quadratic roots to.
I was able to get most of them, but this question really stumped me. Prove the identity: 1 - sin x 1 --------- = tan x + ----- 1 + sin x cos x.
( sin(x) - sin(3x) ) / ( cos(x) - cos(3x) ) = -cot(2x) Let's choose the more complex side (the left hand side). LHS = ( sin(x) - sin(3x) ) / ( cos(x) - cos(3x) ).

Yahoo! Answers - Can anyone prove this trigonometric identities.

Trigonometric identities allow us to simplify a given expression so that it contains sine and cosine. This enables us to solve equations and also to prove other identities. .. Question. Simplify the following: (tan^2 theta times cos^2 theta).

Prove Trigonometric Identities? - Yahoo! Answers.
It will help a lot if you stop typing everything in a jumble. It's hard to understand a grey line. 1 + sin²θ = 1/sec²θ = cos²θ A three headed monster!
Nov 27, 2010. How to prove the following trigonometric identities ? 1) If $displaystyle tan ( alpha) cdot tan(beta) = 1 text{ then } alpha + beta = frac{pi}{2}$.

Tips for proving Trigonometric Identities? - Yahoo! Answers.

Prove trigonometry identity? - Mathematics Stack Exchange.
Trig identities and examples | Trigonometry and precalculus | Khan.

trigonometric identities proof questions

Prove these trig identities!? - Yahoo! Answers.
1.[cos(x-y)]/(sinxcosy)=cotx+tany 2.(sinx-sin3x)/(cosx-cos3x)=-cot2x. 1. cos(x-y) / (sinx cosy) = (cosx cosy + sinx siny) / (sinx cosy) = (cosx cosy).
here's some general guidance 1. usually, converting everything to the more familiar sine and cosine helps. 2. pick the more complex side to simplify.
Jul 30, 2012. I humbly ask for help in the following problem. If begin{equation} A+B+C=180 end{equation} Then prove begin{equation} cos A+cos B+cos.