Question

14. Without using tables, verify that:
(1) cos 60° = (cos² 30° - sin² 30°),​

Answer 1

Answer:

cos60°=1/2

cos30°=√3/2

sin30°=1/2

cos60°=cos^2 30°-sin^2 30°

1/2= (√3/2)^2-(1/2)^2

1/2=3/4-1/4

1/2=2/4

1/2=1/2

hence proved

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Answer 2

Answer:

Hence proveddyrengzbhfhdbgxbxgbgxndhbgdgddv