exam Maths Puzzle Numerical Ability

(tanx-cotx/tanx+cotx) = 1-2cos^2x

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exam Other Question

Buying texts. melissa purchased an engllish text, a math text, and a chemistry text for a total of $276. the english text was $20 more than the math text and the chemistry text was twice the price of the math text. What is the price of each text? Translate the phrase into a variable expression
"the sum of 3 and a number"