Question 1195235
Given that tan x°=3/7 for which x is an acute angle, find without using using mathematical tables or a calculator, cos(90-x)°
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Make right triangle with sides of y = 3 and x = 7
r = sqrt(3^2 + 7^2) = sqrt(58)
cos(90-x) = sin(x) = y/r = 3/sqrt(58)