Check Machin-like formulas/text equations

```pi/4 =  1*arctan(1/2)    +  1*arctan(1/3)
pi/4 =  2*arctan(1/3)    +  1*arctan(1/7)
pi/4 =  4*arctan(1/5)    + -1*arctan(1/239)
pi/4 =  5*arctan(1/7)    +  2*arctan(3/79)
pi/4 =  5*arctan(29/278) +  7*arctan(3/79)
pi/4 =  1*arctan(1/2)    +  1*arctan(1/5)   +   1*arctan(1/8)
pi/4 =  4*arctan(1/5)    + -1*arctan(1/70)  +   1*arctan(1/99)
pi/4 =  5*arctan(1/7)    +  4*arctan(1/53)  +   2*arctan(1/4443)
pi/4 =  6*arctan(1/8)    +  2*arctan(1/57)  +   1*arctan(1/239)
pi/4 =  8*arctan(1/10)   + -1*arctan(1/239) +  -4*arctan(1/515)
pi/4 = 12*arctan(1/18)   +  8*arctan(1/57)  +  -5*arctan(1/239)
pi/4 = 16*arctan(1/21)   +  3*arctan(1/239) +   4*arctan(3/1042)
pi/4 = 22*arctan(1/28)   +  2*arctan(1/443) +  -5*arctan(1/1393) + -10*arctan(1/11018)
pi/4 = 22*arctan(1/38)   + 17*arctan(7/601) +  10*arctan(7/8149)
pi/4 = 44*arctan(1/57)   +  7*arctan(1/239) + -12*arctan(1/682)  +  24*arctan(1/12943)
pi/4 = 88*arctan(1/172)  + 51*arctan(1/239) +  32*arctan(1/682)  +  44*arctan(1/5357) + 68*arctan(1/12943)
pi/4 = 88*arctan(1/172)  + 51*arctan(1/239) +  32*arctan(1/682)  +  44*arctan(1/5357) + 68*arctan(1/12944) [INCORRECT]
```