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[" Q.7.If "cos(sin^(-1)(2)/(5)+cos^(-1)x...

[" Q.7.If "cos(sin^(-1)(2)/(5)+cos^(-1)x)=0," then "x" is equal to "],[" (a) "(1)/(5)],[" (b) "(2)/(5)],[" (c) "0],[" (d) "1]

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