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--------- *------------------- =-------------- =------------------- = -2(√3-√5) =-2√3+2√5=2√5-2√3
√3+√5 √3-√5 3-5 -2
√6 √2+2√3 √12+2√18 2√3 +6√2 √3+3√2
-------- * ---------------- = --------------------- = ------- --------- = - --------------------
√2-2√3 √2+2√3 2-12 -10 5