From 658e5046a48d4740e57e8062478e6dc2786ca673 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20=C4=8Cert=C3=ADk?= <ondrej@certik.us>
Date: Sun, 27 Feb 2022 23:00:01 -0700
Subject: [PATCH 1/3] Implement sin(x)

---
 integration_tests/run_tests.py    |  1 +
 integration_tests/test_math_02.py | 10 ++++++++++
 src/runtime/math.py               | 10 +++++++++-
 3 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 integration_tests/test_math_02.py

diff --git a/integration_tests/run_tests.py b/integration_tests/run_tests.py
index 7a52662c45..0fd3ba4af3 100755
--- a/integration_tests/run_tests.py
+++ b/integration_tests/run_tests.py
@@ -21,6 +21,7 @@
     "test_builtin_int.py",
     "test_builtin_float.py",
     "test_math1.py",
+    "test_math_02.py",
     "test_c_interop_01.py",
 ]
 
diff --git a/integration_tests/test_math_02.py b/integration_tests/test_math_02.py
new file mode 100644
index 0000000000..3ffaef1636
--- /dev/null
+++ b/integration_tests/test_math_02.py
@@ -0,0 +1,10 @@
+from math import sin, pi
+
+def test_sin():
+    # TODO: importing from `math` doesn't work here yet:
+    pi: f64 = 3.141592653589793238462643383279502884197
+    eps: f64 = 1e-12
+    assert abs(sin(0.0)-0) < eps
+    assert abs(sin(pi/2)-1) < eps
+
+test_sin()
diff --git a/src/runtime/math.py b/src/runtime/math.py
index 2ee848857e..bf3105a23d 100644
--- a/src/runtime/math.py
+++ b/src/runtime/math.py
@@ -1,4 +1,4 @@
-from ltypes import i32, f64
+from ltypes import i32, f64, ccall
 
 
 pi: f64 = 3.141592653589793238462643383279502884197
@@ -139,3 +139,11 @@ def lcm(a: i32, b: i32) -> i32:
     if a*b == 0:
         return 0
     return (a*b)//gcd(a, b)
+
+
+@ccall
+def _lfortran_dsin(x: f64) -> f64:
+    pass
+
+def sin(x: f64) -> f64:
+    return _lfortran_dsin(x)

From 805eef56d316e1d371d8e0f2a247d2dc7346d82a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20=C4=8Cert=C3=ADk?= <ondrej@certik.us>
Date: Sun, 27 Feb 2022 23:07:29 -0700
Subject: [PATCH 2/3] Add cos, tan, sqrt

---
 integration_tests/test_math_02.py | 15 ++++++++++++---
 src/runtime/math.py               | 16 ++++++++++++++++
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/integration_tests/test_math_02.py b/integration_tests/test_math_02.py
index 3ffaef1636..40d460d598 100644
--- a/integration_tests/test_math_02.py
+++ b/integration_tests/test_math_02.py
@@ -1,10 +1,19 @@
-from math import sin, pi
+from math import sin, cos, tan, pi, sqrt
 
-def test_sin():
+def test_trig():
     # TODO: importing from `math` doesn't work here yet:
     pi: f64 = 3.141592653589793238462643383279502884197
     eps: f64 = 1e-12
     assert abs(sin(0.0)-0) < eps
     assert abs(sin(pi/2)-1) < eps
+    assert abs(cos(0.0)-1) < eps
+    assert abs(cos(pi/2)-0) < eps
+    assert abs(tan(0.0)-0) < eps
+    assert abs(tan(pi/4)-1) < eps
 
-test_sin()
+def test_sqrt():
+    eps: f64 = 1e-12
+    assert abs(sqrt(2.0) - 1.4142135623730951) < eps
+    assert abs(sqrt(9.0) - 3) < eps
+
+test_trig()
diff --git a/src/runtime/math.py b/src/runtime/math.py
index bf3105a23d..9cda71a852 100644
--- a/src/runtime/math.py
+++ b/src/runtime/math.py
@@ -140,6 +140,8 @@ def lcm(a: i32, b: i32) -> i32:
         return 0
     return (a*b)//gcd(a, b)
 
+def sqrt(x: f64) -> f64:
+    return x**(1/2)
 
 @ccall
 def _lfortran_dsin(x: f64) -> f64:
@@ -147,3 +149,17 @@ def _lfortran_dsin(x: f64) -> f64:
 
 def sin(x: f64) -> f64:
     return _lfortran_dsin(x)
+
+@ccall
+def _lfortran_dcos(x: f64) -> f64:
+    pass
+
+def cos(x: f64) -> f64:
+    return _lfortran_dcos(x)
+
+@ccall
+def _lfortran_dtan(x: f64) -> f64:
+    pass
+
+def tan(x: f64) -> f64:
+    return _lfortran_dtan(x)

From ada81033dd5a217125515a1b8b0d57a9fc54d063 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20=C4=8Cert=C3=ADk?= <ondrej@certik.us>
Date: Sun, 27 Feb 2022 23:22:44 -0700
Subject: [PATCH 3/3] Update integration_tests/test_math_02.py

Co-authored-by: Smit Lunagariya <smitlunagariya.mat18@itbhu.ac.in>
---
 integration_tests/test_math_02.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/integration_tests/test_math_02.py b/integration_tests/test_math_02.py
index 40d460d598..9a0f3959a6 100644
--- a/integration_tests/test_math_02.py
+++ b/integration_tests/test_math_02.py
@@ -17,3 +17,4 @@ def test_sqrt():
     assert abs(sqrt(9.0) - 3) < eps
 
 test_trig()
+test_sqrt()