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Math Help - Hello, I Really Need Help With Trigonometric Identities

  1. #1
    Junior Member
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    Hello, I Really Need Help With Trigonometric Identities

    Hello, i need help with trigonometric identities, if anyone can help me, please add me to your msn messenger, my e-mail is falcolneye@hotmail.com, i need someone to help me!!!

    THANKYOU!
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  2. #2
    Math Engineering Student
    Krizalid's Avatar
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    No, that doesn't make any sense.

    Post your problems and show us what you've done.

    Make it nice and understandable with math formulae. (See my signature.)
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  3. #3
    Junior Member
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    well here's my first problem

    cos琊cos球+sin琊sin球+sin琊+cos球+sin球cos琊=1

    solve this using reciprocal identities, quotient identities, pythagorean identities
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  4. #4
    Senior Member
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    cos琊cos球+sin琊sin球+sin琊+cos球+sin球cos琊=1
    <br />
cos^2x(cos^2y+sin^2y)+sin^2xsin^2y+sin^2x+cos^2y = 1
    <br />
cos^2x+sin^2x+sin^2xsin^2y+cos^2y = 1
    sin^2xsin^2y+cos^2y = 0
    <br />
(sinxsiny)^2 = -cos^2y

    Since (sinxsiny)^2 \geq 0 and -cos^2y \leq 0
    <br />
(sinxsiny)^2 = -cos^2y =  0
    <br />
y = \frac{\pi}{2} +n\pi
    <br />
x = m\pi
    where n,m are integers.
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