6√625/81+4∛-27/8=6*5/3+4*(-3/2)=10-6=4
a5=a1+4d=5+8=13
S5=(5+13)*5/2=45
=2sinacosa/sina-cosa=2cosa-cosa=cosa
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6√625/81+4∛-27/8=6*5/3+4*(-3/2)=10-6=4
a5=a1+4d=5+8=13
S5=(5+13)*5/2=45
=2sinacosa/sina-cosa=2cosa-cosa=cosa