Isolate the variable/solve for $\theta$: $$\sin (2\theta) = 4 \cos (2\theta)$$
Isolate the variable/solve for $\theta$:
$$\sin (2\theta) = 4 \cos (2\theta)$$
Like which $\cos$ double angle formula would I use? Because there are three of them. Thanks in advance.
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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