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OpenStudy (anonymous):
Verify the identity. cos(α - β) - cos(α + β) = 2 sin α sin β
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OpenStudy (anonymous):
can someone please help me. @rvc @dan815
OpenStudy (anonymous):
@nincompoop
OpenStudy (alekos):
Firstly expand cos(α+β) & cos (α-β)
OpenStudy (michele_laino):
hint:
rvc (rvc):
just expand the LHS as i said earlier open the brackets u will get it
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