Question
If A, B, C are the angles of a triangle, then
sin(B+C2)= ___.
sin(B+C2)= ___.
Answer: Option B
:
B
A+B+C=180∘
(sum of angles of a triangle)
⟹B+C=180∘−A
∴B+C2=180∘−A2
B+C2=90∘−A2
Taking sineon both sides we get,
sin(B+C2)=sin(90∘−A2)
∴sin(B+C2)=cosA2
Was this answer helpful ?
:
B
A+B+C=180∘
(sum of angles of a triangle)
⟹B+C=180∘−A
∴B+C2=180∘−A2
B+C2=90∘−A2
Taking sineon both sides we get,
sin(B+C2)=sin(90∘−A2)
∴sin(B+C2)=cosA2
Was this answer helpful ?
More Questions on This Topic :
Question 5. Sin18∘cos72∘=....
Question 6. (1+tanθ+secθ)(1+cotθ−cosecθ)=....
Question 8.
sinA−sinBcosA+cosB+cosA−cosBsinA+sinB=
....
Question 10.
(sec A+tan A−1)(sec A−tan A+1)tan A=
....
Submit Solution