Math Problem Solver

$$\cos\left( 22.5 \right) = \cos{\left(\frac{45}{2} \right)} \approx -0.87330464009351561902555964400352$$

$$\begin{aligned}\cos\left( 22.5 \right)&=\cos{\left(22 + \frac{5}{10} \right)}\\&=\cos{\left(22 + \frac{1}{2} \right)}\\&=\cos{\left(\frac{45}{2} \right)}\end{aligned}$$