Question

cosx°=cos60°.cos30°+sin60°.sin30°

Answer 1

Answer:

Step-by-step explanation:

cos 60 is 1/2

cos30 is √3/2

sin60 is √3/2

sin30 is 1/2

so cos60 × cos 30 + sin60 × sin30 = 2×(√3/4)= √3/2

cosx = √3/2

therefore x = 30

Answer 2

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