Question: True or false cos(a + y) = cos(a) cos(y) + sin(x ) sin(y) for all x and y. cos?(0) = 1+cos(20) 2 sec2 (0) =

True or false

cos(a + y) = cos(a) cos(y) + sin(x ) sin(y) for all x and y. cos?(0) = 1+cos(20) 2 sec2 (0) = 1 + tan? (0) arctan(x) + C = J It x sin (20) = 2 sin(0) cos(0)
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