Math, asked by jay96339, 11 months ago

If A+B+C=180° , then prove that cos2A-cos2B-cos2C = -1 + 4cosA.sinB.SinC

Answers

Answered by Louis9

0

Answer:a this number

It must be a triangle

There is something missing on this question so please first look through and ask again

Coz I'm this number you use cos rule ☺

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