2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
x x x x x x x x x x x x x x x x x x x x
1 + ------ + -------- + -------- + -------- + -------- + -------- + -------- + -------- + -------- + --------- + --------- + --------- + --------- + --------- + --------- + --------- + --------- + --------- + --------- + ---------
cos(x) cos(2*x) cos(3*x) cos(4*x) cos(5*x) cos(6*x) cos(7*x) cos(8*x) cos(9*x) cos(10*x) cos(11*x) cos(12*x) cos(13*x) cos(14*x) cos(15*x) cos(16*x) cos(17*x) cos(18*x) cos(19*x) cos(20*x)
$$\frac{x^{40}}{\cos{\left(20 x \right)}} + \frac{x^{38}}{\cos{\left(19 x \right)}} + \frac{x^{36}}{\cos{\left(18 x \right)}} + \frac{x^{34}}{\cos{\left(17 x \right)}} + \frac{x^{32}}{\cos{\left(16 x \right)}} + \frac{x^{30}}{\cos{\left(15 x \right)}} + \frac{x^{28}}{\cos{\left(14 x \right)}} + \frac{x^{26}}{\cos{\left(13 x \right)}} + \frac{x^{24}}{\cos{\left(12 x \right)}} + \frac{x^{22}}{\cos{\left(11 x \right)}} + \frac{x^{20}}{\cos{\left(10 x \right)}} + \frac{x^{18}}{\cos{\left(9 x \right)}} + \frac{x^{16}}{\cos{\left(8 x \right)}} + \frac{x^{14}}{\cos{\left(7 x \right)}} + \frac{x^{12}}{\cos{\left(6 x \right)}} + \frac{x^{10}}{\cos{\left(5 x \right)}} + \frac{x^{8}}{\cos{\left(4 x \right)}} + \frac{x^{6}}{\cos{\left(3 x \right)}} + \frac{x^{4}}{\cos{\left(2 x \right)}} + \frac{x^{2}}{\cos{\left(x \right)}} + 1$$
1 + x^2/cos(x) + x^4/cos(2*x) + x^6/cos(3*x) + x^8/cos(4*x) + x^10/cos(5*x) + x^12/cos(6*x) + x^14/cos(7*x) + x^16/cos(8*x) + x^18/cos(9*x) + x^20/cos(10*x) + x^22/cos(11*x) + x^24/cos(12*x) + x^26/cos(13*x) + x^28/cos(14*x) + x^30/cos(15*x) + x^32/cos(16*x) + x^34/cos(17*x) + x^36/cos(18*x) + x^38/cos(19*x) + x^40/cos(20*x)