The magnitude of $|-\sin t + \cos t|$ is.
45619
Prove: $|a\sin x+b \cos x|\leq \sqrt{a^2+b^2}$
123136
Proof of the identity: $c\sin \frac{A-B}{2} \equiv (a-b) \cos \frac{C}{2}$
17769
Show that $\frac{\sin x}{\cos 3x}+\frac{\sin 3x}{\cos 9x}+\frac{\sin 9x}{\cos 27x} = \frac{1}{2}\left(\tan 27x-\tan x\right)$
33100
Trigonomnetric equality involving tg
55436
Why does $A\sin{k(x+c)}=a\sin{kx}+b\cos{kx}$ imply that $A=\sqrt{a^2+b^2}$ and $\tan{c}=-b/a$?
66872
Exact values of $\cos(2\pi/7)$ and $\sin(2\pi/7)$
7296
Prove $(1-\cos x)/\sin x = \tan x/2$
151063
Calculate $\int_{0}^{\frac{\pi}{2}}\frac{\sin^{3}(t)}{\sin^{3}(t)+\cos^{3}(t)}dt$ by hands
83359
Complex number identity by trigonometry
14410
If $(1+ \cos A) (1+ \cos B) (1+\cos C)= y = (1- \cos A) (1-\cos B) (1-\cos C)$ then $y = \pm \sin A \sin B \sin C$
27628
Solving $a \sin\theta + b \cos\theta = c$
11711
Prove trigonometry identity for $\cos A+\cos B+\cos C$
98745
To prove $(\sin\theta + \csc\theta)^2 + (\cos\theta +\sec\theta)^2 \ge 9$
147886
Proof of the angle sum identity for $\sin$
151127
Confirm that $\int_{0}^{\infty}t^{-1}\sin t dt=\pi/2$
25569
Intuitive understanding of the derivatives of $\sin x$ and $\cos x$
81102
Cosine of the sum of two solutions of trigonometric equation $a\cos \theta + b\sin \theta = c$