The cofunction of cos is sin(90-x)
90 degrees is equal to PI/2
The cofunction becomes sin(PI/2 - 2PI/9)
Rewrite both fractions to have a common denominator:
PI/2 = 9PI/18
2PI/9 = 4PI/18
Now you have sin(9PI/18 - 4PI/18)
Simplify:
Sin(5PI/18)
I’m sorry i don’t know but i’m thinking it’s B not sure tho
Goes +3
18, 21, 24, 27, 30
T=90-Z
Because 9 solved correctly*10 points per question answered correctly=90 and each incorrect question is a point lost
Answer:
Hope this helps :) look at the picture because I dont know how to type that
Step-by-step explanation: