Wednesday, 19 February 2014

trigonometry - Deriving sine from cosine

If θ is an angle lying between 90 and 180 and cos(θ)=45, why does this mean that sin(θ)=35?

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real analysis - How to find limhrightarrow0fracsin(ha)h

How to find limh0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...