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Exercise 2, Question 5

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$\\int_{-\\pi}^{\\pi} \\cos2x\\cos3x \\space dx = 0 $

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$ \\dfrac{d}{dz} \\cos z = - \\sin z$

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$\\frac{d\\,\\cos z}{dz} = \\sinh z$

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$\\cosh^2 z - \\sinh^2 z = 1$

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Express the trigonometric and hyperbolic functions in exponential form and show that the following equations hold.

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No submission required for this task. Try to solve the problem by yourself and click on Reveal answers to compare with the given solution.

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