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I will give brainliest, 5 stars, and a thanks

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Enter the missing numbers in the boxes to complete the table of equivalent ratios of lengths to widths. ? 18 8 ? 10 30 12 ?

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?