The number of terms in the expansion of (2+3x)" - (2-3x)" is
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(2+3x)"-(2-3x)"=
4+9x^2+6x-(4+9x^2-6x)=
4+9x^2+6x-4-9x^2+6x=6x+6x=12x
the total no.of terms are 1
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