It depends on the problem really because y is a variable and not a constant. It can also mean years so it will equal the amount of years the problem asks.
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1/cos y = sec y
what is c, x + 2y, x+y equal to or greater than 8, x equal to or greater than 3, y equal to or greater than 0.
it is equal to 6y plus y
y=2x-3 y=-x-3
On the unit circle sin(90) degrees is at Y = 1 and as that is on the Y axis X will equal = 0. Ask yourself. Where would 90 degrees be on a 360 degree circle? Straight up.