Помогите ,пожалуйста, номера 5,6,8

5. 30sin(56)*cos(56)/sin(112) = 15*sin(2*56)/sin(112) = 15 6.log4(4-x)=3, 4-x>0, x<4 4^3=4-x 64=4-x x=4-64 x=-60 8.64^(log8(7)) = 8^(2log8(7))=8^(log8(49)) = 49