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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
cos(62) = 12/a // - 12/a
cos(62)-(12/a) = 0
cos(62)-12*a^-1 = 0
-12*a^-1 = -cos(62) // : -12
a^-1 = cos(62)/12
-1 < 0
1/(a^1) = cos(62)/12 // * a^1
1 = (cos(62)/12)*a^1 // : cos(62)/12
12*(cos(62))^-1 = a^1
a = 12*(cos(62))^-1
a = 12*(cos(62))^-1
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