Evaluating $\cos1°\cos2°\cos3°\cdots\cos89°$
61119
Evaluate $\prod_{i=1}^{89} \sin (i)$
6634
Evaluate trigonometric function
135543
Proof of Angles going beyond 90 degrees in Trigonometry
53554
Evaluate $\int \cos(\cos x)~dx$
12617
Getting a standard form quadratic from a set of points ($3$ points)
149913
Evaluate $\iint dy\,dx;\frac{\pi}{4}\leq\theta \leq\frac{3\pi}{4};0\leq r\leq2$
149866
Evaluating $\int_0^{2\pi} \frac {\cos(\theta)}{5-3\cos(\theta)} \, d\theta$ using residue theorem
156720
Evaluate $\sum_ {n=1}^{\infty} \cot^{-1}(2n^2)$
119669
Evaluate $\int \frac{1}{\sin x\cos x} dx $
55128
Evaluation of $\sin \frac{\pi}{7}\cdot \sin \frac{2\pi}{7}\cdot \sin \frac{3\pi}{7}$
146047
Proving that $\cos(2\pi/n)$ is algebraic
44438
Prove : $\frac{\cos(x_1) +\cos(x_2) +\cdots+\cos(x_{10})}{\sin(x_1) +\sin(x_2) +\cdots+\sin(x_{10})} \ge 3$
99584
Evaluation of $\int \frac{\sqrt{\sin ^4x+\cos ^4x}}{\sin ^3x \cos x }dx$
145559
Trigonometry problem on product of trig functions.
48956
Simplify $\arctan (\frac{1}{2}\tan (2A)) + \arctan (\cot (A)) + \arctan (\cot ^{3}(A)) $
118408
Equation with cos and product
60709
How do I get $\cos{\theta} \lt \frac{\sin{\theta}}{\theta} \lt 1$?