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# Can someone help? watch

1. Can someone explain how this comes about. It's a C3 Past Paper in which you have to prove:

tanAsecA + (photo) = sec^2(A)

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2. And also why there is no integral of 1/1+sin2x?

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3. (Original post by TomFitness)
Can someone explain how this comes about. It's a C3 Past Paper in which you have to prove:

tanAsecA + (photo) = sec^2(A)

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I'm confused, what exactly are you trying to prove?
4. (Original post by Zacken)
I'm confused, what exactly are you trying to prove?
Why does that simply to that in the pic?
Then the overall question is below

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6. (Original post by TomFitness)
Why does that simply to that in the pic?
Then the overall question is below

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Oh, multiply the top and bottom by . You get where the denominator is difference of two squares.
7. (Original post by Zacken)
Oh, multiply the top and bottom by . You get where the denominator is difference of two squares.
Thanks at least I understand how to get it but it was only a part of a question:

Proves that:
TanASecA +1/1+sinA
Is the same as sec^2(A)

So if I was to do what you done would I not have to multiply the whole line by 1-SinA?

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8. (Original post by TomFitness)
Thanks at least I understand how to get it but it was only a part of a question:

Proves that:
TanASecA +1/1+sinA
Is the same as sec^2(A)

So if I was to do what you done would I not have to multiply the whole line by 1-SinA?

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No.

Like: . We don't need to multiply the whole line by . just the fraction.

Anyways: .
9. (Original post by Zacken)
No.

Like: . We don't need to multiply the whole line by . just the fraction.

Anyways: .
Thank you!

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10. (Original post by TomFitness)
Thank you!

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No problem.
11. (Original post by Zacken)
No.

Like: . We don't need to multiply the whole line by . just the fraction.

Anyways: .
Thank you!

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12. (Original post by TomFitness)
Thank you!

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No problem?

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Updated: May 16, 2016
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