Find where function positive, negative or zero

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Derivatives of function

Can you suggest a function where this function has certain properties in its derivatives. The (4m+2)th derivative of this function has fixed sign in [ 0 , 3pi/4] and (4m+3)th , (4m+4)th derivatives have...

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Calculate the equivalent impedance

The equivalent impedance Z of two impedances Z1 and Z2 in parallel is given by the formula 1/Z=1/Z1+1/Z2 If Z1=3+5j and Z2=1-3j, calculate Z giving your answer in the form r(cosθ + jsinθ) where...

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