These are the questions

1) Evaluate : tan 95 + tan 40 - tan 95 * tan 40

2) If (√8 + i)^50 = 3^49(a+ib), find a^2 and b^2

3) Prove that : 2cos(pi/13)cos(9pi/13)+cos(3pi/13)+cos(5pi/13)=0

One is from complex numbers. I'm in XIth, need help, i have the formulas, but i can't solve it ,unfortunately. Someone explain it, or atleast solve it please.

And if anyone can give related questions for me to practise, i don't mind.

Thanks in advance. I've been trying it the whole day, and my its doing my head in.