Find the value of
(a) `sin(pi)/(10)+sin(13pi)/(10)` (b) `cos^(2)48^(@)=sin^(2) 12^(@)`

Explanation

Let's solve the question step by step.

### Part (a): Find the value of \( \sin\left(\frac{\pi}{10}\right) + \sin\left(\frac{13\pi}{10}\right) \)

1. **Rewrite \( \sin\left(\frac{13\pi}{10}\right) \)**:
\[ \sin\left(\frac{13\pi}{10}\right) = \sin\left(\pi + \frac{3\pi}{10}\right) \]
...