Question

If cos 3A= sin (2A-30⁰).Find A​

Answer 1

Answer:

cos 3A = sin (2A-30°)

sin(90°-3A)= sin(2A-30°)

90°-3A = 2A- 30°

-5A=-120°

A=120/5

A= 24°

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Answer 2

$\underline{\bigstar{\sf\ Given}}$

cos 3A= sin (2A-30⁰)

$\underline{\bigstar{\sf\ To\:find}}$

A

Step-by-step explanation:

sin ( 90 - 3A ) = sin(2A - 30°)

[cos θ = sin (90 - θ)]

90 - 3A = 2A - 30

- 3A - 2A = - 30 - 90

-5A = - 120

A = - 120/ -5

A = 24 °

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