exam Maths Puzzle Numerical Ability

Please help me with this problem.
Use the given trigonometric value to evaluate the indicated expression.
If sin(t)=14/19, find sin(t-2pi).

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exam Other Question

ron has 63 books on 2 bookshelfs. the longer bookshelf has 5 more books than the shorter book shelf . how many book does the shorter bookshelf have? Please help me solve this equation: f(x,y)= 4+ x-2y over 2
y