Question

What is the value of sin 4A. Plz solve with full explanation. ​

Answer 1

Answer:

We know that ,cos(90-x) = sinx

sin 4A = cos (A-20)

= cos (90-4A) = cos (A - 20)

=90 - 4A = A - 20

=5A = 110

= A = 110/5 = 22 .

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Answer 2

Sin4A = Cos(90-4A)

Cos (90 - 4A) = Cos(A-25)

90 - 4A = A - 25

5A = 115

A = 115/5

A = 23

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