trig

Solve the given triginometric equation analytically. Use values of x for 0 less than or equal to x less than 2pi

P.S Thanks Reiny for your last post, if you are still online.

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asked by Priya
  1. what equation?

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    posted by Reiny
  2. Oops sorry the equation is:

    tan x + 1 = 0

    P.S Please stay online I have a test tommorow and I really need your amazing help on this stuff :)

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    posted by Priya
  3. I hope you know the CAST rule, telling you were each of the trig functions is either + or -

    tanx + 1 = 0
    tanx = -1 so the angle x must be in II or IV
    the angle in standard position is 45ยบ,
    some call it the related acute angle.

    in II x must be 180+45 = 135
    in IV x must be 360-45 = 315

    you should always check your answers with your calculor.

    e.g. tan 315 = -1, does that work in our equation ??

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    posted by Reiny

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