HS Hafizur Rahman
Answers!
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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Answer the question...
HS Hafizur Rahman
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
Comment
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