exam Maths Puzzle Numerical Ability

please help me Indicate whether the problem is true or false show how you got it sin25 degrees = sin155 degrees

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exam Other Question

1. let f(x)=a^x/a^x+3 then evaluate f(1/1996)+f(2/1996)+.........+f(1995/1996)
2. if a and b are the roots of x^4+x^3-1=0. How to prove that ab is the root of x^6+x^4+x^3-x^2-1=0 Please help me solve this equation:

2x-y+4z=-5
x+2y-z=6
x+y+z=1