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satellite73Best ResponseYou've already chosen the best response.3
i guess it depends on what you can use if you can use the addition angle formula, that would work if not maybe with a triangle you can see it
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
i want to do with the triangle one but m wondering how will you show (90+theta) in a right angled triangle?
 one year ago

satellite73Best ResponseYou've already chosen the best response.3
dw:1350098235823:dw
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
yes but that is 90  theta? do 90theta has any relation with 90 + theta ?
 one year ago

satellite73Best ResponseYou've already chosen the best response.3
\[\cos(x)=\frac{a}{c}=\sin(90x)=\sin(x90)\] \[=\sin(x90+180)=\sin(x+90)\]
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
how : sin(x90) = sin(x90+180) ?
 one year ago

satellite73Best ResponseYou've already chosen the best response.3
third equal sign because sine is odd, fourth because \(\sin(x)=\sin(x+180)\)
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
Gotcha now, thanks a lot!
 one year ago

satellite73Best ResponseYou've already chosen the best response.3
your on the other side of the unit circle dw:1350098472701:dw
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
hey, how you did this step? : \[\large{\sin(x90) = sin(x90+180) }\] ?
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
@satellite73 did you subtract sin(180) both sides?
 one year ago

satellite73Best ResponseYou've already chosen the best response.3
i added 180 inside because \(\sin(x)=\sin(x+180)\)
 one year ago
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