Question

If the bisector of the angle A is at right angles to the side BC, then evaluate ∠B-∠C.
answer fast​

Answer 1

Answer:

Correct option is

A

cos(2B−C)

θ=B+2A

We know that in any triangle, ∠A+∠B+∠C=π

⇒θ=B+2π−(B+C)

                   =B+2π−2B−2C

                   =2π+2B−2C

                   =2π+2B−C

∴sinθ=sin(2π+2B−C)=cos(2B−C

Step-by-step explanation:

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