Please.. Minta tolong yaa.. ini limit trigonometri..

Please.. Minta tolong yaa.. ini limit trigonometri..

1.
$frac{5}{2}$
2.
$lim(x - > 0) frac{tanx(cos2x - 1)}{4 times x times x times x} \ lim(x - > 0) frac{tanx( - 2)sinx times sinx}{4 times x times x times x } \ = frac{1 times ( - 2) times 1 times 1}{4 times 1 times 1 times 1} = - frac{1}{2}$
3.
$lim(x - > 0) frac{4x times cos3x}{2cos3x.sinx} = frac{4}{2 times 1} = 2$
4.
$lim(x - > frac{pi}{4} ) frac{cosx - cos( frac{pi}{2} - x)}{x - frac{pi}{4} } \ lim(x - > frac{pi}{4} ) frac{( - 2)sin frac{pi}{4} sin(x - frac{pi}{4} }{x - frac{pi}{4} } \ = ( - 2) times frac{1}{2} sqrt{2} \ = - sqrt{2}$