Question

Giải phương trình:
sin*2x+sinxx.cox=1/2

Answer 1

x = 9.47 degrees ( in first quadrant.

Explanation:

sin2x + sinx cos x = 1/2

Now sinx cos x = 1/2sin2x so:

3/2sin2x = 1/2

sin2x = 1/2 / 3/2

sin2x = 1/2 * 2/3 = 1/3

2x = arcsin 1/3 = 19.47 degrees

x = 9.74 degrees to nearest hundredth.