Sine of the sum of two solutions of $a\cos\theta + b \sin\theta = c$
81102
Cosine of the sum of two solutions of trigonometric equation $a\cos \theta + b\sin \theta = c$
29424
Maximum value of $\sin A+\sin B+\sin C$?
129443
$f(\theta) = \cos \theta - \sqrt{3}\sin \theta$ in the form $r\sin(\theta-\alpha)$
86894
Finding solution of a Trigonometric equation
116270
Functional equations leading to sine and cosine
116205
System of equations in a,b,c,d
135225
How to find the period of the sum of two trigonometric functions
60902
Find general solution for the equation $1 + 2 + \cdots + (n − 1) = (n + 1) + (n + 2) + \cdots + (n + r) $
125171
Help with this trigonometry problem?
91744
Proving sum of sines is periodic when ratio of their frequencies is rational using differentation
123136
Proof of the identity: $c\sin \frac{A-B}{2} \equiv (a-b) \cos \frac{C}{2}$
156468
Solutions to $a+b+c=12$, $a, b, c \in \mathbb{N}_0$
64497
prove that $\tan(\alpha+\beta) = 2ac/(a^2-c^2)$
10289
Need help in proving that $\frac{\sin\theta - \cos\theta + 1}{\sin\theta + \cos\theta - 1} = \frac 1{\sec\theta - \tan\theta}$
1210
Write an expression for $(\cos θ + i\sin θ)^4$ using De Moivre’s Theorem.
50323
Find the general solution for this equation sin5θcos3θ = sin6θcos2θ.
31575
Solving trigonometric equations of the form $a\sin x + b\cos x = c$