1 .If A + B + C = 180°, then find the value of cotAcot B + cotBcotC + cotC cotA.
(A) –1 (B) 1
(C) 10 (D)Ï€

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2 .

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3 .

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4 .

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5 .

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6 .A father is 39 times older than his son. 18 year later, he will be only thrice as old as his son. Father's present age is –

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7 .

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8 .

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9 .If x* y= $(x+ 3)^2$ 2 (y–1), then find the value of 5 * 4.

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10 .If A:B= $1\over2$ : $3\over8$ B:C = $1\over3$ : $5\over9$ and C:D = $5\over6$ : $3\over4$, then find the ratio of A : B : C : D.

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