Hello everyone, I already have answers to the three questions I'm asking but I just want to make sure I am right, Thank you for checking my answers.

1. What is the exact value of the trigonometric expression?

tan(7π4)

2√2

1

−2√2

−1

My answer= -1

2. What is the exact value of the trigonometric expression in simplest form?

sin(5π6)+2tan(7π4)

32

12+2√

12−2√

−32

My answer= -3/2

3.

θ lies in Quadrant II .

cosθ=−811cosθ=−811

What is the exact value of sinθ in simplified form?

−57√11

57√11

857√57

811

My answer= Honestly, for this one, I have no idea. Help me out?

Guest Jan 13, 2018