If 10a=210^a = 210a=2 and 10b=310^b = 310b=3, express log10(1.2)\log_{10}(1.2)log10(1.2) in terms of aaa and bbb.
2a−b+12a - b + 12a−b+1
a+b−1a + b - 1a+b−1
2a+b−12a + b - 12a+b−1
a−b+2a - b + 2a−b+2