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C4 Integration

mathsguru

does anyone know how to integrate 2cosxsecx and 2cotxtanx?

thanx in advance

Reply 1

sig.fig.

cotx is 1/tanx and secx is 1/cosx.
Do you follow?

Reply 2

mathsguru

trunksss6

cotx is 1/tanx and secx is 1/cosx.
Do you follow?

yeah i know but i dont get the right answer

2cosxsecx should integrate to 3/2x

and 2cotxtanx to 4x

i keep getting 2x

Reply 3

sig.fig.

mathsguru

yeah i know but i dont get the right answer

2cosxsecx should integrate to 3/2x

and 2cotxtanx to 4x

i keep getting 2x

Both 2cosxsecx and 2cotxtanx integrate to 2x (plus a constant). What makes you think otherwise? Are you sure you copied the Q out right?

Reply 4

mathsguru

trunksss6

Both 2cosxsecx and 2cotxtanx integrate to 2x (plus a constant). What makes you think otherwise? Are you sure you copied the Q out right?

yeah i've got the questions and the answers

when you say it integrates to 2x plus a constant, what do you mean?

Reply 5

sig.fig.

Forgive me for saying but this whole thread seems like some sort of prank.

I mean exactly what I put. Integrals require constants, but I don't think that is really the issue here, so it can just be forgotten.

Reply 6

Dekota

mathsguru

does anyone know how to integrate 2cosxsecx and 2cotxtanx?

INT 2cosxsecx = INT 2
INT 2cotxtanx = INT 2

INT 2cotxtanx = INT 2cosxsecx = 2x + c

Reply 7

sig.fig.

Dekota

INT 2cosxsecx = INT 2
INT 2cotxtanx = INT 2

INT 2cotxtanx = INT 2cosxsecx = 2x + c

Precisely. Mathsguru, you've either got the question wrong or the answer wrong.

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