Sinθ﹢Cosθ=1/5,
(Sinθ﹢Cosθ)²=1+2sinθcosθ=1/25
2xinθcosθ=-24/25
Sinθ-Cosθ=√[(Sinθ﹢Cosθ)²-4sinθcosθ]=√(49/25)
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