Question

sin 5 theta is equals to cos 4 theta find theta

Answer 1

here sin5theta=cos4theta
so we will write above eqn as..
sin 5theta=sin90-4theta
so 5theta=90-4theta
i.e 9theta=90
hence theta=90/9=10

Answer 2

Hey mate your answer is here....

{{{{{{{{{{{{{{{{{{ Let theta=X }}}}}}}}}}}}}}} Optional

====> sin5X = cos4X

=> cos(90°-5X) = cos4X [°.°cos(90-a) = Sina]

===> 90°-5X = 4X

===> 4X + 5X = 90°

===> 9X = 90°

===> X. =>=>=>. 10°

theta. ===> 10°
Hope it helps you........

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