How to solve this half angle identities

90° ⩽ x ⩽ 180° is another way of saying that the angle "x" is in the II Quadrant, where sine is positive whilst cosine is negative, as you can see in your Unit Circle.  We also know that csc(x) = 2, so

now, the angle "x/2" is half the arc of the angle "x", and since the angle "x" is in the II Quadrant, we can conclude the half of that arc will be on the I Quadrant, where sine and cosine and tangent are all positive.

sinn is the total amount of students now and m were the students before, you subtract them both (n-m) and divide that by m. then, since to get a percentage from a fraction you have to multiply by 100, your answer should look like this: n-m/m*100

step-by-step explanation:

c

step-by-step explanation: