Question

9: Find sinθ if cosθ=4/5 is in the first quadrant.

Answer 1

Answer: We have to find the sin(theta) provided the cos(theta) function, the visualization of the problem is as follows:

`cos(\theta)=(4)/(5)`

The diagram visualization is:

Therefore the x is:

`x=√(5^2-4^2)=3`

Therefore the answer is:

`sin(\theta)=(3)/(5)`

The answer is Option(C).