Question

cos 30° cos 60°-sin 30° sin 60°=cos 90°

Answer 1

Answer:

cos30°cos60°-sin30°sin60°

cos(a+b)=cosacosb-sinasinb

cos (30°+60°)

cos90°

L.H.S=R.H.S

cos90°=0

this is your answer ❣️❣️✌️✌️

Answer 2

Answer:

LHS=RHS

Step-by-step explanation:

cos30 x cos 60 - sin30 x sin60

= √3/2 x 1/2 - 1/2 x √3/2

=√3/4 - √3/4

=0 = cos90 =RHS

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