649722
798429
298935
809674
178754
2*x=4
23-7x=3x+8
18t + 9 = 9(_ + _ )
2a + b = -4 sendo A= 2 E B = -4
6
d×7≡1mod120
-2x(x+8)
jo sin thita+
cos thita =1 hoy to sin(sin2thita)= ?