please answer in MATLAB

please answer in MATLAB

please answer in MATLAB

Use at least one of the following commands to show that they are equal: expand, simplify, factor or collect. a. tan(3x)=13tan2(x)3tan(x)tan2(x) b. sin(x+y+z)=sin(x)cos(y)cos(z)+cos(x)sin(y)cos(z)+cos(x)cos(y)sin(z) sin(x)sin(y)sin(z) c. sin(4x)=8cos3(x)sin(x)4sin(x)cos(x) d. cos(x)cos(y)=21(cos(xy)+cos(x+y)) Problem 3 Define x and y as symbolic variables and create the two symbolic expression S=x+xy2+y4andT=xy2 Use symbolic operations to determine the simplest form of Q=ST. Use the subs command to evaluate the numerical value of the result of Q for x=9 and y=2. Use Q1 for the numerical value. Problem 4 (Bxtra Credit - 2 points) A cylindrical aluminum fuel tank has an outside diameter of 30 in. and a height of 50 in. The thickness of the wall is t, and the bottom and top ends are 25% thicker. The specific weight of aluminum is 165lb/ft. (SW = Weight/Volume). Determine t if the weight of the tank is 152lb. Hint: Use symbolic variable t to define the solume of the object. Use proper units