Question

(A) If sin 0 =
√3/2
And 0° <8 <90, then the value of cos 20 will be.
​

Answer 1

Answer:

cos 2O = -1/2

Step-by-step explanation:

if sin O=√3/2

then P=√3

H=2

H²=P²+B²

B²=H²-P²

on solving we will get B =1

cos O=1/2

cos 2O=cos²O-sin²O

on solving we will get

cos 2O=-1/2