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# A2 Maths - P3 Integration watch

1. Could anyone show me how to go about integrating this please?

2/ (cos^2 x/2)

Its from the Exexcel P3 Textbook, Exercise 4a, question 16 on page 107 if anyone has it.

Emma xxx
2. (Original post by Emz)

2/ (cos^2 x/2)

Its from the Exexcel P3 Textbook, Exercise 4a, question 16 on page 107 if anyone has it.

Emma xxx
is this written as:

2/[cos (0.5) x]^2
3. it's the integral of sec² which is tan
4. It's written as I first wrote it:

2
________
cos² x/2

Is that any easier to see?

Emma xxx

P.S. Thanks elpaw, I understand that is where I'm heading but I need the actual method
5. ok, its 4tan(x/2) +C
6. Could you explain why its 4 please?

Emma xxx
7. because wen the half comes out, it becomes 4*1/2 = 2.
8. (Original post by Emz)
Could you explain why its 4 please?

Emma xxx
1/cos^2 = sec^2

Integrate sec^2, you get tan.
9. Aah right, thank you elpaw!!

Emma xxx

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