1.

If A=[((1)/(2)(e^(ix)+e^(-ix)),(1)/(2)(e^(ix)-e^(-ix))),((1)/(2)(e^(ix)-e^(-ix)),(1)/(2)(e^(ix)+e^(-ix)))] then A^(-1) exists

Answer»

for all real x
for positive real x only
for negative real x only
NONE of these

Answer :A


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