cos3a=sin(120-4a) find the value of a
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Answer:theeta = ◇
cosA =sin(90 -◇)
◇ = 3A
Then,
Given eqn : Cos3a = sin (120- 4A)
Sin(90 - 3A) = sin(120 - 4A)
Sin get cancelled both side
90- 3A=130 - 4A
4A - 3A = 130 - 90
A= 40°
Step-by-step explanation:
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