exam Maths Puzzle Numerical Ability

prove that if two tangents TP and TQ are drawn to a circle with centre O from an external point T, then anglePTQ=2*angleOPQ

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exam Other Question

Simplify
(2x^-6y^-4z^0/3^-2x^-2y^-8z^5)^3
Please help with radical 12x^3/5. /12x^3/5 The entire equation is under the radical sign.