Hi, can somebody tell me if there issomething wrong with this solution? should the denomination ofnumber 2

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Hi, can somebody tell me if there issomething wrong with this solution? should the denomination ofnumber 2 be 2(ps.pm)? if not please explain it forme S= 1/(2PS); M= 1/(2PM) dS/dI = 1/(2PS); dM/d I= 1/(2PM) Thus, 1) M dS/dI = I/(2PSPM) And 2) S dM/dI = I/(2PMPS)