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If cos (sin^(-1)(2/sqrt(5)) + cos^(-1)x)...

If `cos (sin^(-1)(2/sqrt(5)) + cos^(-1)x)` = 0, then x is equal to
A) `1/sqrt(5) `
B) `(-2/sqrt(5))`
C) `(2/sqrt(5))`
D) 1

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XII BOARD PREVIOUS YEAR PAPER ENGLISH-XII Boards-All Questions
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