Math, asked by sonuk80024, 11 months ago

prove that-cos²A+cos²(A+120°)+cos²(A-120°)=3\2

Answers

Answered by Anonymous

2

Step-by-step explanation:

that-cos²A+cos²(A+120°)+cos²(A-120°)

use formula

cosA+cos(A+120°)+cos(A-120°)

= Cos3A/4

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