Question

найти производную f`(пи/2), если f(x)=4х+cosx

Answer 1

f(x)=4х+cosx

f'(x)=(4х+cosx)'=4-sinx

f'(π/2)=4-sin(π/2)=4-1=3

f'(π/2)=3

Answer 2

$y=4x+cosx\y'=4-sinx\y'(frac{pi}2)=4-sin(frac{pi}2)=4-1=3$