Licson Lee => YSITD: d/dx cos x = -sin x d/dx sin x = cos x d/dx tan x = sec² x #5991844e40b00e54a9912df0

Licson Lee says to YSITD

d/dx cos x = -sin x d/dx sin x = cos x d/dx tan x = sec² x

at Mon, Aug 14, 2017 7:06 PM