Question

Tính:

a) \(\dfrac{5+\sqrt{5}}{\sqrt{5}+2}+\dfrac{\sqrt{5}-5}{\sqrt{5}}-\dfrac{11}{2\sqrt{5}+3}\)

b) \(\dfrac{\sin35°}{\cos35°}\times\tan55°+\dfrac{\cos55°}{\sin55°}\times\cot55°\)

Answer 1

a: \(=-5+3\sqrt{5}+1-\sqrt{5}+3-2\sqrt{5}=-1\)

b: \(=tan35^0\cdot tan55^0+cot55^0\cdot cot55^0=1+cot^255^0\)