Question

If sin 2A=Cos (3A-10)

Answer 1

Step-by-step explanation:

Write cos(3a) as sin(90-3a) and take sin inverse both sides.. which leads to give eqn. 5a =90 a=18° 0r pi/10

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Answer 2

Answer:

A = 20°

Step-by-step explanation:

sin (90 - θ) = cos θ

so,

sin 2A = sin (90-3A+10)

sin 2A = sin (100 - 3A)

2A = 100 - 3A

5A = 100

A = 20°

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