exam Maths Puzzle Numerical Ability

Trigonometry Identities

Prove the identity is true

1/cosx - cosx = sinx tanx

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exam Other Question

the sum of the lengths of the two legs of a right angle triangle is 14 cm. find the length of the shortest hypotenuse. If you select 2 cards from a deck, what is the probability of getting 2 matching cards (2kings, 2fives, and so on)?