Question

cos30.cos60 -sin30.sin60​

Answer 1

cos 30 .cos(90-30) - sin 30. sin(90-30)

cos 30. sin 30- sin 30. cos 30

= 0

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Answer 2

Step-by-step explanation:

cos 30° = √3/2

cos 60° = 1/2

sin 30° = 1/2

sin60° = √3/2

putting the value s we get,

√3/2 × 1/2 - 1/2 × √3/2

= 0 ans.