We'll shift the product -cos x*sin 150 to the left
side:
sin x*cos 150 + cos x*sin 150 =
0.5
We'll recognize the
formula:
sin(x+150) = 0.5
But
sin(x+150) = cos (90 - x - 150) = cos (-x - 60)
sin(x+150)
= - cos (x + 60)
We'll re-write the
equation:
- cos (x + 60) =
1/2
x + 60 = arccos (-1/2)
x +
60 = 120
x =
60
or
x + 60 =
240
x = 240 - 60
x =
180
The solutions of the equation, located in
the range (0,360) are: x = 60 degrees = pi/3 radians and x = 180 degrees = pi
radians.
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