New posts in Trigonometry

Proving the limiting behavior of functions containing iterated trigonometric functions.

$A\cos(\theta) + B\sin(\theta)$ for complex $A,B$

Explaining the graph of $\sin(x^2) + \sin(y^2) = 1$

Find limit at 0 of cosine function with embedded sine

Can a triangle ABC be made if $\frac{\cos A}{2}=\frac{\cos B}{3}=\frac{\cos C}{7}$

Write $\cos(5x)$ as a function of $\cos(x)$, answer with a polynomial.

Limit related to $ f(x) = \prod_{i = 1}^x \left( \sin\left( i \frac{\pi}{n}\right) + \frac{5}{4}\right) $?

Sum of 3 unit vectors being shorter than 1

Radius of the circumscribed circle of an isosceles triangle

In quadrilateral $ABCD$, $\angle BAC=\angle CAD=2\,\angle ACD=40^\circ$ and $\angle ACB=70^\circ$. Find $\angle ADB$.