Solving $\sin(\theta) + \cos(\theta) = -1$ using the T-Formula
29604
How to solve $\sin x +\cos x = 1$?
54512
How do I prove: $\cos (\theta + 90^\circ) \equiv - \sin \theta $
138575
Proof that $\cos^2(x)\cosh^2(y) + \sin^2(x)\sinh^2(y) = -1 + \sin^2(x) - \sinh^2(y)$
40556
Why is $\sin(\alpha+\beta)=\sin\alpha\cos\beta+\sin\beta\cos\alpha$
93212
Express $\sqrt{3}\sin\theta - \cos\theta$ as: $a\cos (\theta + \alpha) $
131688
Solve $\sin 7x+\sin 3x=0$
154216
Solve $\sin(z) = z$ in complex numbers
85872
Prove $1 + \tan^2\theta = \sec^2\theta$
113514
Solving $E=\frac{1}{\sin10^\circ}-\frac{\sqrt3}{\cos10^\circ}$
40869
Solving Trigonometric Limits
56195
Find the minimum value of $\sin^{2} \theta +\cos^{2} \theta+\sec^{2} \theta+\csc^{2} \theta+\tan^{2} \theta+\cot^{2} \theta$
69791
How to solve: T(n) = T(n - 1) + n
142610
Solving $\sin x\cos3x+\cos x\sin3x=\sqrt{3}/2$ in the interval $[0,2\pi]$
114411
Simple Proof of the Euler Identity $\exp{i\theta}=\cos{\theta}+i\sin{\theta}$
7492
Is there a formula for $\sin(xy)$
104410
Why do we omit the negative sign when finding basic angle when solving trigonometric equations?
24656
Proving that $\frac{\csc\theta}{\cot\theta}-\frac{\cot\theta}{\csc\theta}=\tan\theta\sin\theta$