Question

Explain the step having star.

Answer 1

$\bf HELLO \: \: DEAR,$

i am taking∆ = d

$\bf \: dy/dx = \frac{2cos(x + \frac{dx}{2})*sin\frac{dx}{2}}{dx}$

$\underline{\bf divide \: \: by (2) \: \: in \: \: denominator \: \: and \: \: numerator}$

$\bf \frac{dy}{dx} = \frac{ \frac{2cos(x + \frac{dx}{2}) * sin \frac{dx}{2}}{2} } { \frac{dx}{2} }$

$\bf \frac{dy}{dx} = \frac{cos(x + \frac{dx}{2}) * sin\frac{dx}{2}}{dx/2}$





$\boxed{\underline {\bf I \: \: HOPE \: \: ITS \: \: HELP \: \: \: \: YOU \: \: DEAR, \: \: THANKS}}$