4-a)
(5^(log[2](5) ) ^ (log[5](4)) = 5^(log[2](5) * log[5](4)) = 4^(log[2](5)) = 2^(2log[2](5)) =2^(log[2](25)) = 25
4-б)
12 sin(76)/(sin(38)sin(52)) = 12 sin(76)/(sin(38)cos(38)) = 12*2*sin(76)/(2*sin(38)cos(38)) = 24*sin(76)/sin(76)=24
4-в)
(16x^2-121)(1/(4x-11)-1/(4x+11)) - x + 3 =
(16x^2-121)((4x+11)-(4x-11))/(16x^2-121)- x + 3 =
22 - x + 3 =
25 - x =
25 - 29 = -4