Question

cos60°=cos^2 30°-sin^2 30°=1/2

Answer 1

LHS

3/4 - 1/4 = 1/2

cos 60 = 1/2

Answer 2

Step-by-step explanation:

cos 60°=1/2

cos 30°= √3/2

sin 30° =1/2

1/2= (√3/2)^2 - (1/2)^2 =1/2

L.H.S

3/4 - 1/4

= 2/4

=1/2 = R. H. S

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