Question

If sin square a = 2 sin a ,then find the value of a

Answer 1

Maybe a value become 2

Answer 2

Answer:

$A = n\pi$, n ∈ Z.

Step-by-step explanation:

$sin^2A - 2sinA = 0$

$sinA(sinA - 2) = 0$

Therefore, $sinA = 0$ or $sinA = 2$

But sinA = 2 is absurd, since sinA ∈ [-1, 1].

Therefore, sinA = 0, which gives the solution:

$A = n\pi$, n ∈ Z.