1.

Find the value of thetha if sin4 thetha = cos thetha​

Answer»

Assume

Sin(4) = sin(PIE)

Now,

Formula is
Sin(pie) = 1-cos(pie)

Then
Sin(THETA) = 1-cos(theta)

Therefore,
Sin(4) = 1-cos(4)
Sin(4) = cos(4-1)
Sin 4 theta = cos 3 theta



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