exam Maths Puzzle Numerical Ability

this is trig identities, if you could please help me prove the following identity true

sin2x / 1-cos2x = 2csc2x-tan

i hope this reads clearly

the left side of the equation is sin2x over 1-cos2x

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exam Other Question

A market vendor wants to mix the liver and the gizzards of chickens to have 40 kilograms of assortment worth 120.00 per kilogram. The liver costs 110.00 per kilogram while the gizzard costs 75.00 per kilogram. How much each kind must be mixed? Directions: find a common solution for each system of equations. The equations are y=x+1 and y=3x-2. My answer for the equations was (1.5,2.5). Am I correct. If not show how you got the answer. Thanx.