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OpenStudy (anonymous):
Show that sin(θ+π)+sin(θ-π)=-2sinθ is this the first step? sinθcosπ+cosθsinπ+sinθcosπ-cosθsinπ and am i left with 2sinθcosπ?
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OpenStudy (raden):
yes, u are right now, u knowed that cos(pi)=-1 right ? so, 2sinθ(-1) = -2sinθ right ?
OpenStudy (anonymous):
wtf??? cos(pi) is -1? omg i din knew that what a waste of 4marks T_T
OpenStudy (raden):
pi is the special degrees in trigonometry, u must know that :p
OpenStudy (anonymous):
is there a website for this? radEn?
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