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A 03/11/2016 in Class IX-X Tuition, Mathematics(Class IX-X Tuition), Sets

A survey of 200 students of a school, it was found that 120 study Mathematics, 90 study Physics and 70 study Chemistry, 40 study Mathematics and Physics, 30 study Physics and Chemistry, 50 study Chemistry and Mathematics an 20 none of these subjects. Find the number of students who study all the three subjects?

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Angel 02/11/2016 in Class IX-X Tuition, Mathematics(Class IX-X Tuition), Trigonometry

What is the value of angle tan ? + angle sin ? / angle tan ? - angle sin ??