cocC-cosD=????? give me formula please
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cosC- cosD
= 2sin{(D+C)/2}×sin {(D-C)/2}
= - 2sin {(D+C)/2}×sin {(C-D)/2}
= 2sin{(D+C)/2}×sin {(D-C)/2}
= - 2sin {(D+C)/2}×sin {(C-D)/2}
111Aslam:
kya (-)nhi aayga kya
where?
=-2sin(c+d/2).sin(c-d/2)
i think this is answer Kya y shi h kya
yes. sin{(D-C)/2} = - sin {(C-D)/2}
ohh ya thanks
ok. welcome
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