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[" 1.If "tan theta=(4)/(5)," then "cos^(...

[" 1.If "tan theta=(4)/(5)," then "cos^(2)theta-sin^(2)theta=],[[" (a) "(9)/(16)," (b) "(16)/(9)," (c) "(9)/(41)," (d) "(16)/(25)]]

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