`sin(5theta)/sintheta` is equal to `a.16cos^4theta-12cos^2theta+1, b.16cos^4theta+12cos^2theta+1, c.16cos^4theta-12cos^2theta-1, d.16cos^4theta+12cos^2theta-1`

Explanation

`frac{sin(4 theta+theta)}{sin theta}`


`=
frac{sin4 thetacos theta+cos4 thetasin theta}sin theta`
​
`=
frac{
2sin2 thetacos2 thetacos theta+cos4 thetasin theta
​}{sin theta}`
...