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7. Prove that :fa) 2 costa+cot + -cos 5T...

7. Prove that :fa) 2 costa+cot + -cos 5T by arc cos, 5 are cus 2/3 6 on & IF\Eng 8. If a and B are the roots of the equation x2 + 5x - 49 = 0, then find the value of cot(cotla + cot'). I

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