Please explain the marked part of the sum (trigonometry ---multiple angles) given in the attachment. Please answer this fast. It's urgent. Tomorrow is exam. Please don't spam it.
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Sorry for not answering your earlier asked questions for I was busy preparing for my review tests.... But I would try to answer all your questions as I hv promised...... Sry again
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ALSO "ALL THE BEST" FOR TOMORROWVS EXAM....
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hii dear
hear is your answer
I hope this answers help you
please mark be brainliest.
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