Find the exact values, there should be no decimals in your answer
tan [sin-1(-1/√5)]

The area of a rectangle is 15+5y square feet. which of the following expressions could be the length of the sides of the rectangle, in feet a. 5 and 3y b. 5 and 3+y c. 5 and 5+y d. 3 and 5+3y

Is the square root of 4 plus the square root of 16 rational?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.