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a fost răspuns

4sin30°-6cos60°+5tg45°=?
2sin60°-4cos30°+3tg60°=?
sin13°+tg37°-cos77°-ctg43°=?

Răspuns :

sin•30°=1/2 cos•60°=√3/2 tg•45°=1 4•1/2-6•√3/2+5•1=7-3√3

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