diff --git a/tensorflow/core/api_def/base_api/api_def_Cos.pbtxt b/tensorflow/core/api_def/base_api/api_def_Cos.pbtxt
index 43fb75836f2..1aeb89c9a60 100644
--- a/tensorflow/core/api_def/base_api/api_def_Cos.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Cos.pbtxt
@@ -1,4 +1,15 @@
 op {
   graph_op_name: "Cos"
   summary: "Computes cos of x element-wise."
+  description: <<END
+  Given an input tensor, this function computes cosine of every
+  element in the tensor. Input range is `(-inf, inf)` and
+  output range is `[-1,1]`. If input lies outside the boundary, `nan`
+  is returned.
+
+  ```python
+  x = tf.constant([-float("inf"), -9, -0.5, 1, 1.2, 200, 10000, float("inf")])
+  tf.math.cos(x) ==> [nan -0.91113025 0.87758255 0.5403023 0.36235774 0.48718765 -0.95215535 nan]
+  ```
+END
 }
diff --git a/tensorflow/core/api_def/base_api/api_def_Cosh.pbtxt b/tensorflow/core/api_def/base_api/api_def_Cosh.pbtxt
index aaeb4ccbd50..bcc9d73e41c 100644
--- a/tensorflow/core/api_def/base_api/api_def_Cosh.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Cosh.pbtxt
@@ -1,4 +1,14 @@
 op {
   graph_op_name: "Cosh"
   summary: "Computes hyperbolic cosine of x element-wise."
+  description: <<END
+  Given an input tensor, this function computes hyperbolic cosine of every
+  element in the tensor. Input range is `[-inf, inf]` and output range
+  is `[1, inf]`.
+
+  ```python
+  x = tf.constant([-float("inf"), -9, -0.5, 1, 1.2, 2, 10, float("inf")])
+  tf.math.cosh(x) ==> [inf 4.0515420e+03 1.1276259e+00 1.5430807e+00 1.8106556e+00 3.7621956e+00 1.1013233e+04 inf]
+  ```
+END
 }
diff --git a/tensorflow/core/api_def/base_api/api_def_Sin.pbtxt b/tensorflow/core/api_def/base_api/api_def_Sin.pbtxt
index f4edefb66d4..c052b451f9f 100644
--- a/tensorflow/core/api_def/base_api/api_def_Sin.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Sin.pbtxt
@@ -1,4 +1,14 @@
 op {
   graph_op_name: "Sin"
-  summary: "Computes sin of x element-wise."
+  summary: "Computes sine of x element-wise."
+  description: <<END
+  Given an input tensor, this function computes sine of every
+  element in the tensor. Input range is `(-inf, inf)` and
+  output range is `[-1,1]`.
+
+  ```python
+  x = tf.constant([-float("inf"), -9, -0.5, 1, 1.2, 200, 10, float("inf")])
+  tf.math.sin(x) ==> [nan -0.4121185 -0.47942555 0.84147096 0.9320391 -0.87329733 -0.54402107 nan]
+  ```
+END
 }
diff --git a/tensorflow/core/api_def/base_api/api_def_Sinh.pbtxt b/tensorflow/core/api_def/base_api/api_def_Sinh.pbtxt
index a6784e8a59e..de3a1c1b3a0 100644
--- a/tensorflow/core/api_def/base_api/api_def_Sinh.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Sinh.pbtxt
@@ -1,4 +1,15 @@
 op {
   graph_op_name: "Sinh"
   summary: "Computes hyperbolic sine of x element-wise."
+  description: <<END
+  Given an input tensor, this function computes hyperbolic sine of every
+  element in the tensor. Input range is `[-inf,inf]` and output range
+  is `[-inf,inf]`.
+
+  ```python
+  x = tf.constant([-float("inf"), -9, -0.5, 1, 1.2, 2, 10, float("inf")])
+  tf.math.sinh(x) ==> [-inf -4.0515420e+03 -5.2109528e-01 1.1752012e+00 1.5094614e+00 3.6268604e+00 1.1013232e+04 inf]
+  ```
+END
 }
+
diff --git a/tensorflow/core/api_def/base_api/api_def_Tan.pbtxt b/tensorflow/core/api_def/base_api/api_def_Tan.pbtxt
index 20f3e4eab3d..83098ae0663 100644
--- a/tensorflow/core/api_def/base_api/api_def_Tan.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Tan.pbtxt
@@ -1,4 +1,15 @@
 op {
   graph_op_name: "Tan"
   summary: "Computes tan of x element-wise."
+  description: <<END
+  Given an input tensor, this function computes tangent of every
+  element in the tensor. Input range is `(-inf, inf)` and
+  output range is `(-inf, inf)`. If input lies outside the boundary, `nan`
+  is returned.
+
+  ```python
+  x = tf.constant([-float("inf"), -9, -0.5, 1, 1.2, 200, 10000, float("inf")])
+  tf.math.tan(x) ==> [nan 0.45231566 -0.5463025 1.5574077 2.572152 -1.7925274 0.32097113 nan]
+  ```
+END
 }
diff --git a/tensorflow/core/api_def/base_api/api_def_Tanh.pbtxt b/tensorflow/core/api_def/base_api/api_def_Tanh.pbtxt
index 3658ee641a7..362c88116ca 100644
--- a/tensorflow/core/api_def/base_api/api_def_Tanh.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_Tanh.pbtxt
@@ -1,4 +1,14 @@
 op {
   graph_op_name: "Tanh"
   summary: "Computes hyperbolic tangent of `x` element-wise."
+  description: <<END
+  Given an input tensor, this function computes hyperbolic tangent of every
+  element in the tensor. Input range is `[-inf, inf]` and
+  output range is `[-1,1]`.
+
+  ```python
+  x = tf.constant([-float("inf"), -5, -0.5, 1, 1.2, 2, 3, float("inf")])
+  tf.math.tanh(x) ==> [-1. -0.99990916 -0.46211717 0.7615942 0.8336547 0.9640276 0.9950547 1.]
+  ```
+END
 }