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[" (5) If "cos^(2)x+cos^(4)x=1," prove t...

[" (5) If "cos^(2)x+cos^(4)x=1," prove that "tan^(2)x+tan^(4)x=1],[" 6.(i) If "sin A=(12)/(13)" ,find the value of "2tan A+cot A" ,A being positive acute."]

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