Monday, July 6, 2015

Solve the equation sinx*cos150=0,5-cosx*sin150 if 0

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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