Mathematics, 12.01.2020 23:31 001035783

If, a+b+c=π
(i) prove that, sina+sinb-sinc = 4sina/2. sinb/2. cosc/2
(ii) prove that, cos^2a + cos^2b-cos^2c = 1-2sina. sinb. cos. c
(iii) prove that, cosa+cosb-cosc = -1+4cosa/2. cosb/2.sinc/2

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If, a+b+c=π
(i) prove that, sina+sinb-sinc = 4sina/2. sinb/2. cosc/2
(ii) prove that, co...

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