March 29, 2017

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how do i evaluate the function csc 11 pie/4 without using a calculator


    Subtract 2 pi from (11/4) pi and you get (3/4)pi. That is in the second quadrant, where the sin and csc functions are positive.
    The reference angle is
    pi - (3/4)pi = pi/4
    Thus we have
    csc(11/4)pi = csc(3/4)pi = csc(pi/4)
    = 1/sin(pi/4) = sqrt2
    The sine is 1/sqrt2 because the reference angle is 45 degrees. You can get sine 45 from the Pythagorean theorem.

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