Witch expression is equivalent to( 3x+4)-(7x+2)

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

Sun country bus lines has 80000 shares of stock outstanding what would the dividend per share of stock be from a dividends declaration of 109600