" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
u = sinx + cosx
u' = cosx - sinx
v = sinx
v' = cosx
f ' (x) = (u'v - uv') / v²
f ' (x) = ((cosx - sinx)(sinx) - (sinx + cosx)(cosx)) / (sinx)²
f ' (x) = ((sinxcosx - sin²x) - (sinxcosx + cos²x)) / sin²x
f ' (x) = (-sin²x + cos²x) / sin²x
f ' (x) = -1 + cos²x / sin²x
f ' (π/2) = -1 + cos² 90° / sin² 90°
= -1 + (0)² / (1)²
= -1 + 0
= -1
Maaf kalau salah