sin50 - sin70 + sin10 =
A1
B0
C1/2
D2
Answer:
B. 0
Read Explanation:
sinA+sinB2sin(A+B/2)cos(A-B/2) sinA-sinB=2cos(A+B/2) sin50 - sin70 + sin10 = 2cos(50+70/2)sin(50-70/2)+sin10 =2cos60xsin(-10)+sin10 =2x1/2x-sin(10)+sin(10) =0
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sin50 - sin70 + sin10 =
A1
B0
C1/2
D2
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