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How to do number 1, 4, 5 and 6?

How to do number 1, 4, 5 and 6? quadratic equations -ox • a O - O of t he and are the ot equation + "b = O are - 2 (a • • + + O real. Solve the equation: Ec-d are the roots of + c O anda 5. • 8 those of • C prove that the roots of the quadratic equation px + q 0 are tan 30' and tary1S• tnen find the value Of 2 + q — p, then value ot

Hi, 
6th:
Refer the similar question:​
https://www.meritnation.com/ask-answer/question/if-the-roots-of-the-eq-x2-px-q-0are-tan-30-and-tan-15-then-f/complex-numbers-and-quadratic-equations/2922919

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