How to prove $n$ is even in this trigonometric equation?
129680
Prove that $n$ is even.
54175
Prove the trigonometric identity $\sin^4{x} = \frac{3-4\cos{2x}+\cos{4x}}{8}$
147886
Proof of the angle sum identity for $\sin$
120795
Showing that $\sin^2x\cdot\sin^22x\cdot\sin^24x\cdot\sin^28x\cdots\sin^22^nx\leq\frac{3^n}{4^n}$
107067
Finding the argument of $z=1-\cos(2\theta)-i\sin(2\theta)$
56697
How to show that the given equation has at least one complex root ,a s.t |a|>12
156641
Show that $\gcd(3n,3n+ 2) = 1$ when $n$ is odd
123267
Proving that even numbers equal the sum of two odd numbers.
113080
Prove $\tan\big(\frac{\pi}{2} -\theta \big) = \cot \theta$
147684
Prove that $\sin \theta=\frac{3 \sin \alpha+\sin^3 \alpha}{1+3\sin^2 \alpha}$ using given condition
113119
Use the division algorithm to prove that 3|(n³ + 2n) for all n ∈ ℕ
126574
Proving $\prod_k \sin \pi k / n = n / 2^{n-1}$
9986
Prove $ \sin(A+B)\sin(A-B)=\sin^2A-\sin^2B $
86894
Finding solution of a Trigonometric equation
2402
Does $\sin n$ have a maximum value for natural number $n$?
98745
To prove $(\sin\theta + \csc\theta)^2 + (\cos\theta +\sec\theta)^2 \ge 9$
40269
Proving if $x^3$ is even, then $x$ is even.