cal trig identities
d/dx sin x
cos x
d/dx cos x
- sin x
d/dx tan x
sec^2 x
d/dx csc x
- csc x cot x
d/dx sec x
sec x tan x
d/dx cot x
- csc^2 x
ln (a/b)
ln (a) - ln (b)
ln (a . b)
ln (a) + ln (b)
ln (a^b)
b ln ^a
tan theta
sin/cos
cot theta
cos/sin
sin theta
1 / csc
cos theta
1 / sec
tan theta
1 / cot