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Write the expression as a constant , a single trigonometric function, or a power of a trigonometric function. sin x cos x/ tan x

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

How to do this , and can some one explain