Basic trigonometric values.

both = -

Step-by-step explanation:

is an angle in the 3rd quadrant where both sin and cos < 0

The related acute angle is , then

cos ( ) = - cos ( ) = - = -

sin ( ) = - sin ( ) = - =

srry ask agian

step-by-step explanation:

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this