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    Verify a Trigonometric Identity

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    Prove that sin2 x + cos2 x = 1 using only this information : Cos x = (e^jx + e^-jx)/2, sin x = (e^jx - e^-jx)/(2j)
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    Solution Preview

    Cos x = (e^jx + e^-jx)/2, sin x = (e^jx - e^-jx)/(2j)

    Solution Summary

    A trigonometric identity is proven. The expert proves a sin and cos function.