There’s not actually a question. But I might be able to help if u show the full problem
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)
Answer:
4y²-1/4 is the required answer
Step-by-step explanation:
The answer is D because to use Pythagorean Theorem it has to be a right triangle.