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Q.

If for x(0,  π2),log10sinx+log10cosx=1 and log10(sinx+cosx)=12(log10n1),  n>0  then the value of n is equal to:

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a

16

b

9

c

20

d

12

answer is D.

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Detailed Solution

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sinx.cosx=110         (sinx+cosx)2=n10

1+sin2x=n10    1+15=n10      n=(65)×10=12

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