Saturday, 27 July 2013

trigonometry - Alternate form of cosine + sine into cosine

I am trying to rewrite 250013cos(1000t)120065sin(1000t) into a phrase that only is only a cosine. What trig identities are there to help me do this in general? I am not sure where to start to reformulate this.

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real analysis - How to find limhrightarrow0fracsin(ha)h

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