SOLUTION: can someone help me with the following i'm kind of lost at what to do. thanks!!
"Evaluate the following expressions:"
a.) {{{cot(-pi/2)}}}
b.) {{{sin^2(5pi/6)}}}...(note) that
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Question 47978: can someone help me with the following i'm kind of lost at what to do. thanks!!
"Evaluate the following expressions:"
a.)
b.) ...(note) that is sin^2
c.) ...(note) that is sec^2
d.) is finding out an angel first of all
i know that i have to use the unit circle but i dont know what to do.
any help would help thanks!!!
Answer by ChillyWiz282(3) (Show Source): You can put this solution on YOUR website!
1. cot, , , , then
2. has a reference angle of } and in Quadrant 2. sin is negative in Quadrant 2. , so .
Take the square of gives us 1/4
3. has a reference angle of and in Quadrant 4. Sec is positive in Quadrant 4. and then
Squaring it gives
4.
since in both Quadrant 1 and 4, sec(-30degree) is positive
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