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sin3π/5 x cos4π/15−sin4π/15 x cos3π/5..cu cat egal?

Răspuns :

Matepentrutoti
Sin3π/5 x cos4π/15−sin4π/15 x cos3π/5=
=sin(3π/5-4π/15)=
=sin5π/15=
=sinπ/3=
=√3/2
Am folosit: sin(a-b)=sina ·cosb-sinb·cosa

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