What is the value of Cos 150 Degrees
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Answer:
cos150°=cos(90°+60°)
cos(A+B) = cosAcosB-sinAsinB
cos(90°+60°)=cos90°cos60°-sin90°sin60°
=0(1/2)-1(√3/2)
=0-√3/2
= -√3/2
cos150°= -√3/2
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