Math, asked by sunithadurga50, 6 months ago

prove that sin780×sin480+cos240×cos300=1/2

Answers

Answered by kumarsantosh04984

3

Answer:

Sin780° = Sin(360 + 360 + 60)° = Sin60° = √3/2. Sin480° = Sin(360 + 90 + 30)° = Cos30° = √3/2. Cos240° = Cos(180 + 60)° = -Cos60° = -1/2. Cos300° ...

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