If 𝑎 cos 𝜃 − 𝑏 sin 𝜃 = 𝑥 and 𝑎 sin 𝜃 + 𝑏 cos 𝜃 = 𝑦 , prove that 𝑎2 + 𝑏2 = 𝑥2 + 𝑦2.
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If 𝑎 cos 𝜃 − 𝑏 sin 𝜃 = 𝑥 and 𝑎 sin 𝜃 + 𝑏 cos 𝜃 = 𝑦 , prove that 𝑎2 + 𝑏2 = 𝑥2 + 𝑦2.
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.