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tan x
sinx/cosx
cos²+sin²
1
1+tan²x
sec²x
1+cot²x
csc²x
Double angle formula: sin2x
2sinxcosx
double angle formula: cos2x
cos²x-sin²x
= 2cos²x-1
=1-2sin²x
derivative of sinx
cosx
derivative of cos x
-sinx