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d/dx(cotx)
-cosec²
d/dx(cosec)
-cosec x cot
tan² =
sec² + 1
cot² =
cosec² - 1
d/dx(tanx) =
sec²
d/dx(secx) =
secxtanx
∫ udv =
uv - ∫ vdu
when x is small
sinx = x
tanx = x
cosx = 1 - x²/2