Geography, asked by sidak4477, 11 months ago

use the formula cos 2theta = 2 cos² thetha - 1 to find the value of cos 120

Answers

Answered by ayushman1484

1

Answer:

-1/2

Explanation:

Put X=60°

cos2(60)°=2cos²(60)°-1

cos120°=1/2-1

cos120°=-1/2

Answered by rudradave

1

This is your solution and please kindly next time post this question in maths and not geography

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