Question

If x= cos theta + i sin theta , write the value of x ^4 - 1/x^4

Answer 1

Answer:

x=1

Step-by-step explanation:

cos theta +sin theta =1

Answer 2

x+iy=1+cosθ+isinθ1

=2cos22θ+i2sin2θcos2θ1

=2cos2θ1×cos2θ+isin2θ1

=2cos2θ1×ei2θ1

 =2cos2θ1×e−i2θ=2cos2θ1(cos2θ−)

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