exam Maths Puzzle Numerical Ability

verify the identity

sin(a+B)/sin(a-B) = tan a + tan B/tan a - tan B

Don't know how to make the correct symbols...sorry.

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THE RANDOLPHS USED 12 MORE GALLONS OF FUEL OIL IN OCTOBER THAN IN SEPTEMBER AND TWICE AS MUCH OIL IN NOVEMBER AS IN SEPTEMBER. IF THEY USED 132 GALLONS FOR THE THREE MONTHS, HOW MUCH WAS USED DURING EACH MONTH?

THANKS FOR ANY HELP. Write an equation for the line in point/slope form and slope/intercept form that passes through (1,4) and parallel to the line 2x-3y=6.