There is no real significance to sine plus cosine, now sin2(x) + cos2(x) = 1 for any x, where sin2(x) means to take the sign of the number, then square that value.
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If x equals 10 and y equals 10, then 9x plus 8y equals 170.
it equals x1 it equals x1
x=4 y=0
5x+3y
it is equal to 6y plus y