exam Maths Puzzle Numerical Ability

Good evening ma'am or sir will you please help on how to solve this problem involving expressions with exponents? Thank you very much.

2). One mole of water has a mass of 18 g a

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HOW DO YOU SOLVE TAN(-3/4pi), sin(x-1/2pi), sin(5pi/3), tan(5pi/6), sin(pi-x)
tan(1/2pi-x), cos(4pi-x), cos(x+3/2pi), tan(x+1/2pi), sin(-2/3pi), cos{-5/4pi},
tan(5pi/6), cos(7pi Can some one help me solve this problem?
Suppose instead that the town experiences growth that can be modeled by the following:
P=1000 squareroot t+ P, WHERE T IS THE NUMBER OF