Simplify: sqrt10+2sqrt21\\sqrt{10 + 2\\sqrt{21}}sqrt10+2sqrt21
sqrt7+sqrt3\\sqrt{7} + \\sqrt{3}sqrt7+sqrt3
sqrt10+sqrt21\\sqrt{10} + \\sqrt{21}sqrt10+sqrt21
sqrt7−sqrt3\\sqrt{7} - \\sqrt{3}sqrt7−sqrt3
sqrt10\\sqrt{10}sqrt10