Question

cos60 degree cos 30 degree + sin 60 degree sin30 degree​

Answer 1

Step-by-step explanation:

We know that,

Cos A Cos B + Sin A Sin B = Cos(A-B)

Cos60 Cos 30 + Sin 60 Sin 30 = Cos (A-B)

= Cos (60-30)

= Cos 30

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{ \sqrt{3} }{2}$

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