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[" 65.If one vertex of a square whose di...

[" 65.If one vertex of a square whose diagonals intersect at origin is "3(cos theta+i sin theta)" then "],[" the two adjacent vertices are "],[[" (a) "+-(sin theta+i cos theta)," (b) "+-(cos theta-i sin theta)],[" (cat) "2" (sin "theta+i cos theta)," (d) None of these "]]

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(cos theta + i sin theta)^3 xx (cos theta-i sin theta)^4=

"(cos theta+i sin theta)^(6)(cos theta-i sin theta)^(-3)

" (i) "(cos theta+sin theta)/(cos theta-sin theta)

( cos 3 theta - sin 3 theta )/( cos theta+ sin theta ) =

((cos theta + i sin theta) / (sin theta + i cos theta)) ^ (4) = cos8 theta + i sin8 theta

( sin 3 theta )/( sin theta ) -(cos 3 theta )/( cos theta )=