Hint: $\sin^2(6x)-\sin^2(4x) = \sin(2x)\sin(10x)$
9986
Prove $ \sin(A+B)\sin(A-B)=\sin^2A-\sin^2B $
27628
Solving $a \sin\theta + b \cos\theta = c$
96388
Prove $\sin(x)\tan(x) > x^2$ for $x \in ( \,0, \frac{\pi}{2}) \,$
17188
Simplify $\cos(n \pi)$ and $\sin(n \pi)$ when n is an integer
108245
Solving the complex equation $\sin(z) = \cos(z)$
57330
Find the number of solutions of $\sin x+2 \sin 2x- \sin 3x=3$
77990
How many solutions $X^{10} - I=0$ has in $M_2(\mathbb{R})$?
50614
If $4\mid a+bc$ and $6\mid b+ac$ prove that $2\mid a^2-b^2$
1210
Write an expression for $(\cos θ + i\sin θ)^4$ using De Moivre’s Theorem.
131310
Evaluating $\dfrac{1}{\sin(2x)} + \dfrac{1}{\sin(4x)} + \dfrac{1}{\sin(8x)} + \dfrac{1}{\sin(16x)}$
105496
Need help solving - $ \int (\sin 101x) \cdot\sin^{99}x\,dx $
105487
Prove that $\sin x \cdot \sin (2x) \cdot \sin(3x) < \tfrac{9}{16}$ for all $x$
149447
Proving $\sin (x)=\cos (90^\circ-x)$
87242
Ways to prove $ \int_0^\pi dx \frac{\sin^2(n x)}{\sin^2 x} = n\pi$
130104
Show $4x^2+6x+3$ is a unit in $\mathbb{Z}_8[x]$ (inverting unit + nilpotent)
142610
Solving $\sin x\cos3x+\cos x\sin3x=\sqrt{3}/2$ in the interval $[0,2\pi]$
120569
Trigonometric Functions And Identities Question .