1.

Show that (i) (3+isqrt(5))^(12)+(3-isqrt(5))^(12) is real and (ii) ((13-i)/(5-3i))^(15)-((7+4i)/(2+3i))^(15) ia purely imaginary.

Answer»


Answer :`(i)z` is REAL
`(II) z` is PURELY IMAGINARY.


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