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cos(0)=?
1
sin(0)=?
0
y = sinx
y’ = cosx
y = cosx
y’ = -sinx
y = tanx
y’ = sin/cos
y = cscx
y’ = 1/sinx
y = secx
y’ = 1/cosx
y = cotx
y’ = cosx/sinx
y = tan x →
sec²x
y = cotx →
-csc²x
y = secx →
secxtanx
y = cscx →
-cscxcotx
sin(pi/6) & cos(pi/6)
30 deg: ½ & sqrt3/2
sin(pi/4) & cos(pi/4)
45 deg: sqrt2/2 for both
sin(pi/3) & cos(pi/3)
60 deg: sqrt3/2 & ½
lim h→0
f(x+h)-f(x) / h
lim x→a
f(x)-f(a) / x-a