Question

Find the exact value of cos 150 degrees and sin 150 degrees

Answer 1

Cos and Sin 150
This will be the same as a 30 degree angle only in Quadrant 2.
In Q2, Cosine s negative and Sine is positive.
Cos 150 = (-√3)/2
Sin 150 = 1/2

Answer 2

The exact value of of the trigonometry indentities $Cos150 =\dfrac{-\sqrt{3}}{2}}$ and $Sin150 =\dfrac{1}{2}$

What is trigonometry?

Trigonometry is the relationship between the sides of the triangle and the angle of the right angle triangle. It contains the angle Sin,Cos,Sec,tan,Coses etc.

Here we will calculate the value of Cos150 and Sin150`

$Cos150=Cos(180-30)=-Cos30=-\dfrac{\sqrt{3}}{2}$

Similarly for the value of Sin150

$Sin 150 =Sin(180-30)=Sin30=\dfrac{1}{2}$

Hence The exact value of of the trigonometry indentities $Cos150 =\dfrac{-\sqrt{3}}{2}}$ and $Sin150 =\dfrac{1}{2}$

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