Question

Find the exact values of cosine, sine, and tangent for angle 225˚.

Answer 1

this is 3rd quadrant where the angle is \[180 + x = 225\]

solve for x.

then find exact value of sin, cos and tan.

but remember

In the 3rd quadrant sin and cos are negative and tan is positive...

Answer 2

soo 225-180??

Answer 3

@campbell_st

Answer 4

yeah, that's right.

Answer 5

that gives you the angle you will need to work with...

Answer 6

then you have to use the 3rd quadrant facts

tan (225 - 180) will be positive

sin(225 -180) will be negative

cos(225 - 180) will be negative

the angle you will use has an exact value.