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Q.

If for x∈0,π2,  log10sinx+log10cosx=-1    and   log10(sinx+cosx)=12log10n-1,n>0, then the value of n is equal to

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a

16

b

9

c

12

d

20

answer is C.

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Detailed Solution

log10sinx+log10cosx=−1⇒log10sinxcosx=−1⇒sinxcosx=110⇒sin2x=15And log10sinx+cosx=12logn10−1⇒sinx+cosx2=n10⇒1+sin2x=n10⇒1+15=n10⇒n=1065=12
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