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Let z=reꜞᶿ=r(cosθ+isinθ).




Dividing we get: tan4θ=-4/3 from which sin4θ=-4/5, cos4θ=3/5.

Squaring and adding: r⁸=25, r⁴=5, r=∜5=1.4953 approx.

4θ=-0.9273 approx, θ=-0.2318; sinθ=-0.2298, cosθ=0.9732.

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