Increase alllowed tolerance in tan()/sec() tests

Part of addressing #320 #232 #197

S02-types/num.t

@@ -522,8 +522,10 @@ ok Num === Num, 'Num === Num should be truthy, and not die';
         is-approx tan(my num $ =   -π), my num $ =  0e0,        '-π';
         is-approx tan(my num $ =  π/4), my num $ =  1e0,        'π/4';
         is-approx tan(my num $ = -π/4), my num $ = -1e0,        '-π/4';
-        is-approx tan(my num $ =  π/2),  (sin(π/2) / cos(π/2)), 'π/2';
-        is-approx tan(my num $ = -π/2), -(sin(π/2) / cos(π/2)), '-π/2';
+        is-approx tan(my num $ =  π/2),  (sin(π/2) / cos(π/2)), 'π/2',
+            :rel-tol<5e-5>;
+        is-approx tan(my num $ = -π/2), -(sin(π/2) / cos(π/2)), '-π/2',
+            :rel-tol<5e-5>;
     }
 
     subtest 'atan(num)' => {
@@ -556,8 +558,10 @@ ok Num === Num, 'Num === Num should be truthy, and not die';
         is-approx sec(my num $ = -π/4), my num $ =  2/√2, '-π/4';
 
         # Since we don't have perfect π, cheetsy-doodle to get "infinity"
-        is-approx sec(my num $ =  π/2), my num $ = tan(π/2), 'π/2';
-        is-approx sec(my num $ = -π/2), my num $ = tan(π/2), '-π/2';
+        is-approx sec(my num $ =  π/2), my num $ = tan(π/2), 'π/2',
+            :rel-tol<5e-5>;
+        is-approx sec(my num $ = -π/2), my num $ = tan(π/2), '-π/2',
+            :rel-tol<5e-5>;
     }
 
     subtest 'asec(num)' => {