exam Maths Puzzle Numerical Ability

-2a(a^2b^2+ab-4)=

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exam Other Question

can you please help me solve this: (2y^3z^2)(6y^4) Give the amplitude and the period of each of the following:
(a) y = 1/2 sin 3x (a)____________
(b) y = 3 cos 1/2x (b)____________