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If z=1-costheta+isintheta,\ t h e n\ |z|...

If `z=1-costheta+isintheta,\ t h e n\ |z|` is a. `2sin(theta/2)` b. `2cos(theta/2)` c. `2\ |sin(theta/2)|` d. `2\ |cos(theta/2)|`

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` z= (1 - costheta + isintheta) `
` z = a+ib `
` a = 1-costheta, b = sintheta `
` |z| = sqrt (a^2+b^2) = sqrt ((1-costheta)^2 +( sintheta)^2 `
...
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