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Chapter 9: Q. 4 (page 591)

Find the value

Sin120鈭�=_____Cos240鈭�=_____

Short Answer

Expert verified

The answer to the expression is

sin120鈭�=0.866cos240鈭�=-0.5

Step by step solution

01

Step 1. Given

Trigonometric expressions.

sin120鈭�&cos240鈭�

02

Step 2. Calculation

Using trigonometric identities we get

sin120鈭�=sin(90+30)=cos30=32=0.866

Similarly

cos240鈭�=cos(180+60)=-cos(60)=-12=-0.5

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