Question

cos2 30° + cos2 45° + cos2 60°​

Answer 1

Step-by-step explanation:

(√3/2)² +(1/√2)²+(1/2)²

=3/4+1/2+1/4

=3+2+1/4

=6/4

=3/2

I hope this is helful for you...

Answer 2

Answer : 3/2

Step-by-setp Explanation:

Evaluate:

cos2 30° + cos2 45° + cos2 60° + cos2 90°

Value of trigonometric ratios are:

=>

cos30° = √3/2 cos45° = 1/√2

cos60° = 1/2 cos90° = 0

Substituting the value in given question :

[ √3/2]² + [ 1/√2]² + [1/2]²+0

= 3/4 + 1/2 + 1/4

= 3/2

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