Question

(ii) verify that: cos 60°cos 30° + sin 60°sin 30º = cos 30°
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Answer 1

Step-by-step explanation:

Prove:. cos 60°cos 30° + sin 60°sin 30° = cos 30°

Sol:

LHS = (1/2)*√3/2 + √3/2 * 1/2

= √3/4 + √3/4

= 2√3/4

= √3/2

=cos 30°

=RHS

∆LHS = ∆RHS

Hence, Proved.