add case for cosin function

tests/system-test/2-query/sin.py

@@ -473,7 +473,7 @@ class TDTestCase:
         tdSql.execute('insert into tb2 values (now(), {}, {})'.format(PI*2.5 ,PI*2.5))
 
         for i in range(100):
-            tdSql.execute('insert into tb3 values (now()+{}s, {}, {})'.format(i,PI*(2.5+i) ,PI*(2.5+i)))
+            tdSql.execute('insert into tb3 values (now()+{}s, {}, {})'.format(i,PI*(5+i)/2 ,PI*(5+i)/2))
 
         self.check_result_auto_sin("select num1,num2 from tb3;" , "select sin(num1),sin(num2) from tb3")
     

tests/system-test/fulltest.sh

@@ -24,4 +24,5 @@ python3 ./test.py -f 2-query/floor.py
 python3 ./test.py -f 2-query/round.py
 python3 ./test.py -f 2-query/log.py
 python3 ./test.py -f 2-query/pow.py
-python3 ./test.py -f 2-query/sin.py
\ No newline at end of file
+python3 ./test.py -f 2-query/sin.py
+python3 ./test.py -f 2-query/cos.py
\ No newline at end of file