Trigonometry - simplifying a given equation
42391
Calculate $\tan9^{\circ}-\tan27^{\circ}-\tan63^{\circ}+\tan81^{\circ}$
116270
Functional equations leading to sine and cosine
83359
Complex number identity by trigonometry
108245
Solving the complex equation $\sin(z) = \cos(z)$
33396
Generalizing a Trig Identity
31852
An elegant way to solve $\frac {\sqrt3 - 1}{\sin x} + \frac {\sqrt3 + 1}{\cos x} = 4\sqrt2 $
87934
Deducing $\sin x + \cos x \ge 1$ from $(\sin x + \cos x)^2 = 1 + 2 \sin x \cos x$
83332
Trig sum: $\tan ^21^\circ+\tan ^22^\circ+\cdots+\tan^2 89^\circ = \text{?}$
59065
Roots to an equation using analysis
93372
How to solve CSC = sin-1?
68881
Solve for $\theta$: $a = b\tan\theta - \frac{c}{\cos\theta}$
153111
factoring a quadratic equation
145463
How to factorise $2 \sin^2θ – 3\sinθ +1 = 0$
617
Find θ: $β=\arctan\frac{(R+r)·\sin(θ)-r·\sin(θ(1+\frac{R}{r}))}{(R+r)·\cos(θ)-r·\cos(θ(1+\frac{R}{r}))}$
51729
Solve the following equation: $\sqrt {\sin x - \sqrt {\cos x + \sin x} } = \cos x$
148207
Express $\cos 6\theta $ in terms of $\cos \theta$
1317
Combining cosine or sine terms into a single cosine or sine