exam Maths Puzzle Numerical Ability

prove or disprove without a calculator.

1. sin(pi/2 + theta) = cos theta

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exam Other Question

Solve the system by addition.
4x + 6y = 9
8x - 3y = -7 I need help to perform the indicated operation

f(x)=x+2 g(x)=x2 -1

I need to find (g of)(x)