Question

If sin²a =sin a then find the value of a.

Answer 1

sin²a = sin a

this means for any angle "a" the value should be 1
we know sin 90 = 1 also sin² 90= 1² = 1
there fore angle a = 90

Answer 2

Here,

$sin {}^{2} a = sin \: a$

$= > \frac{{sin}^{2} a}{sin \: a} = 1$

$= > sin \: a = \: 1$

$= > sin \: a = sin \: 90$

$= > a = 90$

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