Posted by **anonymous** on Friday, January 8, 2010 at 12:39am.

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

- MATH ANALYSIS -
**drwls**, Friday, January 8, 2010 at 7:52am
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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