Question

if cos 30 degree is equal to root 3 by 2 then find the value of cot 15 degree

Answer 1

Answer:

Cos 30

Cos 2(15)

By cos2a = 2cos^2(a)-1

2cos^2 (15) - 1 = cos 2 (15)

Root3/2+1=2cos^2(15)

Root3/4+1/2=cos^2(15)

(Root3 + 2)/4 = cos^2(15)

$\sqrt{ \frac{ \sqrt{3} + 2 }{4} } = cos15$

Hope it may help you mate

#stayhome #staysafe

❣️❣️❣️