-0,87*(10)^3-5.4*(-10)^2+130=870-540+130=460
4^3\4^(log_5(10)) *4^(log_5(2)) =4^3*4^(log_5(2\10))=4^3*4^(log_5(1\5))=4^3*4^)(log_5(5^(-1)) =4^3*4^(-1)=4^(3+(-1))=4^(2)=16
tg(arccos3/5)=sin(arccos3/5)/cos(arccos3/5)=(4/5)/(3/5)=4/3
cos(arccos3/5)=3/5
cos^2(arccos3/5)=9/25
sin^2(arccos3/5)=16/25
sin(arccos3/5)=4/5