If A 2x2, show that A^-1 = A^T if and only if : [Hint: If a^2+b^2=1, then a=cosθ, b= sinθ for some θ. Use cos(θ-)=cosθcosϕ+sinθsinϕ]
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Originally Posted by sshh If A 2x2, show that A^-1 = A^T if and only if : [Hint: If a^2+b^2=1, then a=cosθ, b= sinθ for some θ. Use cos(θ-)=cosθcosϕ+sinθsinϕ] If , so we get . Now use the huge hint you're given... Tonio
What have you done so far? Where are you stuck? Essentially, you solve the equation, ...
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