Math, asked by AbhishekGhanwat, 1 year ago


*In ∆ ABC,cos (B+C) is equal to _____*

Answers

Answered by cuteipie82
2
In ∆ ABC

ANGLE A + ANGLE B + ANGLE C = 180

ANGLE B + ANGLE C = 180 - Angle A

cos (B+C) = Sin (90-180 + Angle A)
= Sin ( Angle A - 90)

AbhishekGhanwat: tys
AbhishekGhanwat: tys
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