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Chapter 6: Q. 9 (page 436)

find the exact value of the expression

cos(-120掳)

Short Answer

Expert verified

cos120掳=-12

Step by step solution

01

Step 1. Rewriting the expression 

As cos is a even function so, cos(x)=cos(-x)

So given expression can be written as cos(120掳)

02

Step 2. Calculations

cos(蟺-x)=-cosxcos(120掳)=cos蟺-60掳=-cos(60)掳-cos(60)掳=-12

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