Question

Discriminant of the quadratic equation x² +7 x-60=0 will be *

273

150

289

189

​

Answer 1

Answer:

sinS+sin(S-A)+sin(S-B)-sin(S-C)

{sinS-sin(S-C)}+{sin(S-A)+sin(S-B)}

2cos(2S-C)/2sin(C/2)+2sin(C/2)cos(B-A)/2

=2sinC/2[cos(A+B)/2 +cos(B-A)/2]

=2sinC/2 .[2cos(B/2)cos(A/2)]

=4cos(A/2)cos(B/2)sin(C/2)

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