exam Maths Puzzle Numerical Ability

The combined resistance of two resistors in a parallel circuit is given by the formula

RT=1/(1/R1+1/R2)



Simplify the formula.

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exam Other Question
Find all the solutions to the equation cosx = -1. 6x^2y^3 + 9x^2y^3
3x^2y^2

can you help me solve this