The sine of any acute angle is equal to the cosine of its complement. Meanwhile, the cosine of any acute angle is equal to the sine of its complement. Sine and cosines are called "cofunctions".
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3x^2 -6 = 10 -x^2
4x^2= 16
x^2= 4
x= -2 or 2
If 1 inch = 10 miles, then 5 inches would represent 50 miles