Question

cos 60°=cos² 30° -sin² 30°​

Answer 1

Answer:

Trigonometry values will put in this question

1/2=(√3/2)2-(1/2)2

3/4-1/4=2/4=1/2=L.H.S

Answer 2

Step-by-step explanation:

cos60=1/2

sin30=1/2,cos30=root3/2

given that,

sin square 30=1/4

cos square 30=3/4

cos square 30-sin square 30

=3/4-1/4

=2/4

=1/2=cos 60

hence proved