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June 11th, 2010, 08:01 PM   #1
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Proving Trigonometric Identities

Hi everyone. Just wondering if anyone can solve these trigonometric questions.

Q1: (cos^2 theta)/(1 + sin theta)= 1 - sin theta

Q2: cosec^2 theta + sec^2 theta=(tan theta + cos^2 theta)

Thanks
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June 11th, 2010, 08:48 PM   #2
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Re: Proving Trigonometric Identities

1) In the norminator there is



and cancel so there is the first identity.
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June 12th, 2010, 06:25 AM   #3
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Q1: As above, cos²?/(1 + sin ?) = 1 - sin(?), but only when sin ? ? -1.

Q2: Not an identity.
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June 12th, 2010, 06:38 AM   #4
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Re: Proving Trigonometric Identities

Hello, muito_bossa!

You said "solve these questions" . . . ??

[color=beige]. . [/color]We answer questions.
[color=beige]. . [/color]We solve equations.

Did you mean "Prove the identities" ?


Quote:





Quote:

This is not an identity . . .

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June 12th, 2010, 03:16 PM   #5
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Re: Proving Trigonometric Identities

Thanks for the help. In regards to Q2 I think that it might be an error from the textbook as I've pretty much tried everything but to no avail.
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