cos(a+b) +cos(3b-a)=2cos2bcos(a+b)
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plz make the question clear
SulagnaRoutray:
2 cos 2bcos?????
2 cos 2b cos (a-b)
Sorry I can't answer
but I can ask it 2 my teacher and then I will answer u
It's okkkk
But till then u have to wait
not an issue
In which class do u read dear
hey sis plz delete this answer
plz plz
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