Question

my friend's. please answer correctly..


please give relevant ANSWER

Answer 1

here is ur answer hope it helps

Answer 2

Solution :

Here I am using A instead of theta.

4cos² A = 1

=> cos² A = 1/4

=> cos A = ±√1/4

=> CosA = ± 1/2

=> CosA = Cos 60° [ A is acute ]

A = 60°

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