Question

please help!
If cscθ = 1 1/4, then cosθ = _____.


±3/5
±4/5
±3/4
±1 2/3

Answer 1

\[\pm 4/5\]

Answer 2

@fastestfalconever thank you so much! do you mind helping me on this on too?? ):

Answer 3

Simplify the expression.

1/2 (-sin^2x - cos^2x)

-1 1/2
-1/2
1/2

Answer 4

Are -1 1/2, -1/2, and 1/2 your choices for an answer?

Answer 5

yess

Answer 6

1/2(-sin^2x -cos^x)
Distribute the 1/2
Which equals -1/2sin^2x -1/2cos^2x
Cos^2x = 1-sin^2x
So now you have -1/2 sin^2x -1/2(1-sin^2x)
Distribute -1/2 into (1-sin^2x)
Which equals -1/2 + 1/2sin^2x
So now you have (-1/2 sin^2) -1/2 (+1/2sin^2x)
Whats in parenthesizes cancels leaving you with your answer
-1/2