Proving trigonometric problem from given trigonometric equations
81102
Cosine of the sum of two solutions of trigonometric equation $a\cos \theta + b\sin \theta = c$
2648
Show that the equation $\cos(\sin x)=\sin(\cos x)$ has no real solutions.
131120
Proving an integral equation.
116270
Functional equations leading to sine and cosine
44119
Prove that $\cos (A + B)\cos (A - B) = {\cos ^2}A - {\sin ^2}B$
120148
prove this properties of triangles trigonometric question
58932
Hard contest type trigonometry proof
73047
Proving surjectivity of $\cos(z)$ and $\sin(z)$ and find all $z : \cos(z) \in \mathbb R$ and all $z: \sin(z) \in \mathbb R$
111102
Prove the Trigonometric Identity: $\frac{\sin x}{1-\cos x} = \frac{1+\cos x}{\sin x}$
111696
Show $\sin x = bx$ has at least 3 real solutions.
125171
Help with this trigonometry problem?
46665
Solving $\cos x+\sin x-1=0$
135895
Proving the bounds of cosine
129880
Proving $\frac{1}{\sin^{2}\frac{\pi}{14}} + \frac{1}{\sin^{2}\frac{3\pi}{14}} + \frac{1}{\sin^{2}\frac{5\pi}{14}} = 24$
116580
Prove by induction: $\sin{x}+\sin{3x}+\dots+\sin{(2n-1)x}=\frac{\sin^2{nx}}{\sin{x}}$
9986
Prove $ \sin(A+B)\sin(A-B)=\sin^2A-\sin^2B $
107067
Finding the argument of $z=1-\cos(2\theta)-i\sin(2\theta)$