Solve $\cos x +\cos y - \cos(x+y)=\frac 3 2$
31937
How do I prove equality of x and y?
26486
How to find all the solutions to cos$(z)=0$
37108
Solve $\cos(z)=\frac 34+\frac i4$
51729
Solve the following equation: $\sqrt {\sin x - \sqrt {\cos x + \sin x} } = \cos x$
89309
How to solve this trigonometric system of equations numerically?
149254
Solving $y^3=x^3+8x^2-6x+8$
114270
How do I solve this equation?
69682
Roots of $y=x^3+x^2-6x-7$
62529
Solve $y’ = \frac{2-xy^3}{3x^2y^2}$ using Bernoulli form
133164
Rational solutions for $x^2+y^2=3$
59791
Determine the exact value of equations involving more two trig variables
156266
Solving $|x-2| + |x-5|=3$
63155
Express $1+2\cos a$ as a product
82170
Solve $x = \frac{1}{2}\tan(x)$
68881
Solve for $\theta$: $a = b\tan\theta - \frac{c}{\cos\theta}$
44119
Prove that $\cos (A + B)\cos (A - B) = {\cos ^2}A - {\sin ^2}B$
108245
Solving the complex equation $\sin(z) = \cos(z)$