Tuesday, 19 January 2016

trigonometry - How do I evaluate cos(x)+cos(2x)+cos(3x)+...+cos(nx)?

How to evaluate the above expression and express the answer in terms of n and x?

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real analysis - How to find limhrightarrow0fracsin(ha)h

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