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    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.
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    (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.
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    lnsec or lncos?
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    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
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    (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.
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    (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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