Maths

1.           Prove that,     sinA{B+C/2}=cosA/2

HS Hafizur Rahman's image
HS Hafizur Rahman
Jan. 27, 2019, 3:42 p.m.

Answers!

HS Hafizur Rahman's image
HS Hafizur Rahman
Jan. 27, 2019, 3:48 p.m.

We know that,

      A+B+C=180°

=B+C=180°-C

     =(B+C/2)=180°/2-A/2

     =sin(B+C/2)=sin(90°-A/2)

     =SIN(B+C/2)=cosA/2.     prove

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