Question

Good evening

sin 4A = cos (A - 20°), where 4A is an acute angle, find the value of A.​

Answer 1

Answer:

Hello Mate.......

Sin 4 A = Cos ( A- 20 ° )

Cos 90° - 4A = Cos ( A - 20° )

90° - 4A = A - 20 °

90° - 4A - A = - 20°

90° - 5 A = - 20 °

- 5 A = - 20° - 90°

- 5A = - 110°

5 A = 110 °

A = 110° / 5

A = 22 °

Therefore, the value of ' A ' = 22°

Step-by-step explanation:

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