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Math Help - Trigonometric functions of any angle

  1. #1
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    Wink Trigonometric functions of any angle

    Can someone show me the solution in this one?

    3 tan 240º - sin² 135º + 2 cot 210º
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  2. #2
    Senior Member
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    Hi jasonlewiz.

    Quote Originally Posted by jasonlewiz View Post
    Can someone show me the solution in this one?

    3 tan 240º - sin² 135º + 2 cot 210º
    What's the problem? Don't you have a calculator on your own?

    btw, it is tan = sin/cos and cotan = 1/tan = cos/sin

    Therefore you got to solve

    3 sin(240º)/cos(240°) - sin(135º)*sin(135°) + 2 cos( 210º)/sin(210°)


    Yours
    Rapha
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  3. #3
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    tan (240º) = tan(180º + 60º)

    sin (135º) = sin (180º - 45º)

    cot (210º) = cot (180º + 30º) = 1 / tan (180º + 30º)
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