28<7y<42
prove that
sin 2x = 2 sin x cos x
solve x over 2 -7 =8 x =
5
1/tan x = cot x
x^3+2x^2-4x-5
SMALLEST NUMBER WHICH IS DIVISIBLE BY 180AND 270
x=[3/8(72)+5/7(35)]
1/3 * -/- = 1/6
f(x)=x-9
