**What is the exact values of cos 150 and sin 150?**

Take Θ=30

Cos 150°

If Cos (180° – Θ)= -Cos Θ,

Then Cos (180 – 30)= -Cos Θ.

Cos 150 = -Cos 30 (√3 /2),= 0.8660

Sin 150°

If Sin (180° – Θ)= Sin Θ,

Then Sin (180 – 30)= Sin Θ,

Sin 150 = Sin 30 = 0.5.

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