exam Maths Puzzle Numerical Ability

b^3-16b=0

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exam Other Question

Use unit multipliers to convert 600 milliters per minute to liters per hour identity:
tan2a+sin2a/2cos^2a=
=2sinacosa/2cos^2a
=2sina+sqr1-cos^2a/2cos^2a
=????

ans:
1. sin1+cos2a
2. tan2a
3. cos^2a-sin^2a
4. cot2a
5. 0