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Calculati:
[tex](2- \frac{ \sqrt{3} }{4} )(2+ \frac{ \sqrt{3} }{4} )[/tex]


Răspuns :

[tex] a^{2}- b^{2}=(a-b)(a+b) => ( 2- \frac{ \sqrt{3} }{4} )( 2+ \frac{ \sqrt{3} }{4} )= 2^{2} - ( \frac{\sqrt3}{4} )^{2} =4-3/16 [/tex]  
=(16-3)/16=13/16
r...............................
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