Verify the trigonometric formula for sin(a+b)=sinacosb+sinbcosa and cos(a+b)=cosacosb-sinasinb by using complex representation.
I tried to use Euler's formula to start but I am unsure how to use complex representation for this.
How to find $\lim_{h\rightarrow 0}\frac{\sin(ha)}{h}$ without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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