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[" If "tan theta=(3)/(4)" then "cos^(2)t...

[" If "tan theta=(3)/(4)" then "cos^(2)theta-sin^(2)theta=,," M "," b "],[[" (a) "(7)/(25)," (b) "1," (c) "(-7)/(25)," (d) "(4)/(25)]]

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