The sine function goes from -1, then to 0, then to 1, and back again. The max an mins are -1 and 1, sine function has a zero value each time it hits 180 or a multiple of 180: 0, 180, 360, etc
That is easy to see if you use a rectangle triangle, its definition is: sine a is equal to the division of the opossite cathetus over the hypothenuse, thus, for that division to be zero, the opposite cathetus has to be zero, that is when the angle is 0, or 180, 360, etc
explain answer: so to get this answer 5x8=40 so like the closes number to eight will be 9 and 10 but they said closes 10 so it will be 5/10 and =u/9 so answer= 5/10=u/9