" Prove that the average of the numbers "n sin n^(@),n=2,4,6,.........,180," is "cot(1)/(4)

Provethat the average of the numbers n sin n^(@),n=2,4,6...180 is cot1^(@)

Prove that 4n^(2)-1 is an odd number for all n in N

Prove that 2 sin 2^(@)+4sin 4^(@)+6sin 6^(@)+........+180sin 180^(@)=90 cot 1^(@) .

Prove that 2 sin 2^(@)+4sin 4^(@)+6sin 6^(@)+........+180sin 180^(@)=90 cot 10^(@) .

Prove that 2 sin 2^(@)+4sin 4^(@)+6sin 6^(@)+........+180sin 180^(@)=90 cot 10^(@) .

The arithmetic mean of the numbers 2s in2^0,4sin4^0,6sin^0, ddot, 178s in 178^0,180sin180^0 is sin1^0 b. "tan"1^0 c. cot1^0 d. t a n 89^0

Prove that 2 + 4 + 6 + .... + 2n = n (n + 1)

Prove that 2sin2^(0)+4sin4^(0)+6sin6^(0)+......+180sin180^(@)=90cot1^(0)

Prove that t a n A+2t a n2A+4t a n4A+8cot8A=cot Adot