Question

Solve 2sin^2 x -5sinx-3=0

Answer 1

Call sin x = x. This is a quadratic equations: 2x^2 - 5x -3 = 0.
Solve by factoring: (2x + 1)((x - 3) = 0.
a) x = sin x = -1/2 = sin 7Pi/6 and sin 11Pi/6
b) x = sin x = 3: rejected as > 1
x = .... and x = ..... (0 < x < 2Pi)

Answer 2

How do these threads that are 13 hours old suddenly come up in the menu on the left???

Answer 3

bc i bumped it

Answer 4

ahhh! i see...