How to solve $\sin78^\circ-\sin66^\circ-\sin42^\circ+\sin6^\circ$
90226
Proving trigonometric equation $\cos(36^\circ) - \cos(72^\circ) = 1/2$
135519
How to approach solving $\int_0^{\pi/2} \ln(a^2 \cos^2 x +b^2 \sin^2 x ) dx$
62446
Solve the equation $x^2+\frac{9x^2}{(x+3)^2}=27$
68881
Solve for $\theta$: $a = b\tan\theta - \frac{c}{\cos\theta}$
104658
proving $\csc^2 \left( \frac{\pi}{7}\right)+\csc^2 \left( \frac{2\pi}{7}\right)+\csc^2 \left( \frac{4\pi}{7}\right)=8$
149254
Solving $y^3=x^3+8x^2-6x+8$
107816
Solving a six-degree polynomial of the form $ax^6+bx^3+g$.
54175
Prove the trigonometric identity $\sin^4{x} = \frac{3-4\cos{2x}+\cos{4x}}{8}$
39492
Finding $z\in \mathbb C$ with $\sin z = 2$?
617
Find θ: $β=\arctan\frac{(R+r)·\sin(θ)-r·\sin(θ(1+\frac{R}{r}))}{(R+r)·\cos(θ)-r·\cos(θ(1+\frac{R}{r}))}$
142610
Solving $\sin x\cos3x+\cos x\sin3x=\sqrt{3}/2$ in the interval $[0,2\pi]$
123867
Solve $(a + b\sin(x))\sin(x) = p$ for $x$
66161
How to solve the equation $n^2 \equiv 0 \pmod{584}$?
100907
$\sin\alpha + \sin\beta + \sin\gamma = 4\cos{\frac{\alpha}{2}}\cos{\frac{\beta}{2}}\cos{\frac{\gamma}{2}}$ when $\alpha + \beta + \gamma = \pi$
140983
$ \tan 1^\circ \cdot \tan 2^\circ \cdot \tan 3^\circ \cdots \tan 89^\circ$
38254
Trigonometry Olympiad problem: Evaluate $1\sin 2^{\circ} +2\sin 4^{\circ} + 3\sin 6^{\circ}+\cdots+ 90\sin180^{\circ}$
56170
Solve a complex equation symbolically?