Question

1) Daca $x^{2} + \frac{1}{ x^{2}} =83$,calculati x-1\x
2)Aria unui triunghi MNP =72 $cm^{2}$.Daca MN=6 radical din 3 si MP=16 cm,atunci m(∠M) ESTE EGALA CU ...........?????

Answer 1

1.(x-1/x)²=x²+1/x²-1=83-1=82
x-1/x=√82
2. A=MNxMPxsinM/2
sin M=2A/MNxMP=2x72/6√3x16=√3/2, M=60grade