Question

cos 60 Cos 30 - sin 60 sin 30​

Answer 1

Answer:

cos(a+b)=cosacosb-sinasinb

So,cos60.cos30-sin60.sin30=cos(60+30)=cos90

=0

Answer 2

Step-by-step explanation:

cos 60 = 1/2

cos 30 = root 3/2

Sin 60 = root 3/2

sin 30 = 1/2

1/2 x root 3/2 - root 3/2 x 1/2

root 3/2 - root 3/2

= 0

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