Which sum or difference identity would you use to verify that sin(90°+theta)=cos theta? please help need now
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What aspects of lines have to be diffrent

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

Interpret the following expression (5y^2-7)^3/(2y)^2