\( f'(x)=\lim\limits_{h \to 0}\dfrac{f(x+h)-f(x)}{h} \)
\(f(x)= 5 sec x + 4 cos x\)
\(f(x)= \dfrac{d}{dx}(5secx+4cosx)\)
By further calculation, we get
\(5\dfrac{d}{dx}(secx)+4\dfrac{d}{dx}(cosx)\)
\( 5 \;secx\; tanx + 4 \times (-sinx)\)
\( 5 \;secx \;tanx - 4 sinx\)
Answered by Pragya Singh | 1 year ago