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# P3 integration watch

1. What would be the integral of tanx i know that the differential is sec^2 but never seen the integral of it being mentioned anywhere.
2. (Original post by lexazver203)
What would be the integral of tanx i know that the differential is sec^2 but never seen the integral of it being mentioned anywhere.

lnsecx+C.
3. lnsec or lncos?
4. Its in the formula book so you dont need to learn it.

You can prove it with tanx = sinx/cosx

INT sinx/cosx dx

u = cosx
du/dx = -sinx
du -1 = sinx dx

= INT -1/u du
= -INT 1/u du
= -In u + c
= -In cosx + c
= In secx + c
5. (Original post by Womble548)
Its in the formula book so you dont need to learn it.

You can prove it with tanx = sinx/cosx

INT sinx/cosx dx

u = cosx
du/dx = -sinx
du -1 = sinx dx

= INT -1/u du
= -INT 1/u du
= -In u + c
= -In cosx + c
= In secx + c

is there a formula book online somehwere - just wanted to know what formulas i have to know.
6. (Original post by lexazver203)
is there a formula book online somehwere - just wanted to know what formulas i have to know.
I guess you could try edexcel online, havent looked though.

We got given one at the start of the year

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