# How do you solve #sin2x + 2 sinx cosx - 1= 0#?

##### 1 Answer

May 14, 2015

Reminder: sin 2a = 2sin a.cos a.

f(x) = sin 2x + 2sin x.cos x - 1 = 0

On the trig unit circle:

a.

b.

Check:

May 14, 2015

Reminder: sin 2a = 2sin a.cos a.

f(x) = sin 2x + 2sin x.cos x - 1 = 0

On the trig unit circle:

a.

b.

Check:

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