Question # A-4.
If 0°

# A-4.
If 0°

Solution ( cos x=frac{3}{sqrt{10}} )
( log _{10} sin x+log _{10} cos x+log _{10} tan x )
( =log _{10}(sin x cos x cdot tan x) )
( =log _{10}left(sin ^{2} xright)=log _{10}left(1-cos ^{2} xright) )
( =log _{10}left(1-frac{9}{10}right)=log _{10}left(frac{1}{10}right) )
( =-log _{10} 10 )
( =-1 )
ofrien ( (C) )

Solution