Question

please tell me I will mark him/her in brain list

Answer 1

1) 4cos² A - 3 = 0

4cos² A = 3

cos² A = 3/4

cos A = √3/2

cos A = cos 30°

A = 30°

2) cos 3A

cos 3(30)

cos 90°

0

3) tan² A + cos² A

tan² 30° + cos ² 30°

(1/√3)² + (√3/2)²

1/3 + 3/4

(4+9)/12

13/12

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