h) = 3 sin h (1-3x) cosh (1-3)

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A: show that r = cos 2θ is symmetrical with respect to the horizontal axis.

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Q: Hw) if J-0- Gso and X=O+ Cas e Show that Sece+tan 0

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Q: ii. Verify that the u = -e-Y tany is harmonic in an appropriate domain D.

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Q: 3) Find the exact length of the curve. y = In(cos r), 0 < x<

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