Proof of range of tan $\theta$
112314
On The Range Of The Tangent
143050
If $\tan(\frac{\pi}{4}+\frac{y}{2})=\tan^3(\frac{\pi}{4}+\frac{x}{2})$,then prove that $\sin y=\frac{\sin x(3+\sin^2 x)}{(1+3\sin^2 x)}$
27513
Trigonometric bounds
141645
Trigonometric series sum proof
108995
Prove $|e^{i\theta} -1| \leq |\theta|$
146594
Prove that $\frac{d}{dx}(\tan^{-1}(x))=\frac{1}{1+x^2}dx$
154172
Finding $\tan t$ if $t=\sum\tan^{-1}(1/2t^2)$
60230
Prove that $\frac{1+\sin\theta+i\cos\theta}{1+\sin\theta-i\cos\theta}=\sin\theta+i\cos\theta$
68881
Solve for $\theta$: $a = b\tan\theta - \frac{c}{\cos\theta}$
119815
Why is $\tan((1/2)\pi)$ undefined?
108916
On the proof $\tan 70°-\tan 20° -2 \tan 40°=4\tan 10°$
103988
Prove that $\tan20^°\tan40^°\tan60^°\tan80^°=3$
98745
To prove $(\sin\theta + \csc\theta)^2 + (\cos\theta +\sec\theta)^2 \ge 9$
145759
formal proof from calulus
82286
Derivation of asymptotic solution of $\tan(x) = x$.
68835
Trigonometric limit: Dividing the Numerator and Denominator by $\theta\;?$
35244
Prove $\sin^2\theta + \cos^2\theta = 1$