Solve questions 12 to 18

Q12. if  $\frac{3\left({\cos }^{2}25°+{\cos }^{2}65°\right)}{{\sin }^{2}27°+{\cos }^{2}63°}=\frac{a}{3}$, then find the value of a

Q13. if sin(x – 20^∘) = cos(3x – 10^∘), then find the value of x