1diff --git a/src/RawFormulas/RawFormulas.ts b/src/RawFormulas/RawFormulas.ts
  2index 0869f6b..1a88485 100644
  3--- a/src/RawFormulas/RawFormulas.ts
  4+++ b/src/RawFormulas/RawFormulas.ts
  5@@ -32,7 +32,7 @@ import {
  6   TRUE,
  7   NOT
  8 } from "./Logical"
  9-import {checkArgumentsAtLeastLength, filterOutStringValues, valueToNumber} from "./Utils";
 10+import {checkArgumentsAtLeastLength, filterOutStringValues, valueToNumber, checkArgumentsLength, firstValueAsNumber} from "./Utils";
 11 import { CellError } from "../Errors"
 12 import * as ERRORS from "../Errors"
 13 
 14@@ -129,9 +129,19 @@ var POWER = Formula["POWER"];
 15 var ROUND = Formula["ROUND"];
 16 var ROUNDDOWN = Formula["ROUNDDOWN"];
 17 var ROUNDUP = Formula["ROUNDUP"];
 18-var SIN = function (rad) {
 19+
 20+/**
 21+ * Returns the sine of an angle provided in radians.
 22+ * @param values[0] The angle to find the sine of, in radians.
 23+ * @returns {number} Sine of angle.
 24+ * @constructor
 25+ */
 26+var SIN = function (...values) {
 27+  checkArgumentsLength(values, 1);
 28+  var rad = firstValueAsNumber(values[0]);
 29   return rad === Math.PI ? 0 : Math.sin(rad);
 30 };
 31+
 32 var SINH = Formula["SINH"];
 33 var SPLIT = Formula["SPLIT"];
 34 var SQRT = Formula["SQRT"];
 35diff --git a/src/RawFormulas/Utils.ts b/src/RawFormulas/Utils.ts
 36index 16351b4..e973a69 100644
 37--- a/src/RawFormulas/Utils.ts
 38+++ b/src/RawFormulas/Utils.ts
 39@@ -55,6 +55,21 @@ function valueToString(value: any) : string {
 40   }
 41 }
 42 
 43+/**
 44+ * Takes any input type and will throw a REF_ERROR or coerce it into a number.
 45+ * @param input to attempt to coerce into a number
 46+ * @returns {number} number representation of the input
 47+ */
 48+function firstValueAsNumber(input: any) : number {
 49+  if (input instanceof Array) {
 50+    if (input.length === 0) {
 51+      throw new CellError(ERRORS.REF_ERROR, "Reference does not exist.");
 52+    }
 53+    return firstValueAsNumber(input[0]);
 54+  }
 55+  return valueToNumber(input);
 56+}
 57+
 58 
 59 /**
 60  * Converts any value to a number or throws an error if it cannot coerce it to the number type
 61@@ -65,6 +80,9 @@ function valueToNumber(value: any) : number {
 62   if (typeof value === "number") {
 63     return value;
 64   } else if (typeof value === "string") {
 65+    if (value === "") {
 66+      return 0;
 67+    }
 68     if (value.indexOf(".") > -1) {
 69       var fl = parseFloat(value);
 70       if (isNaN(fl)) {
 71@@ -119,6 +137,7 @@ export {
 72   flatten,
 73   valueToNumber,
 74   valueToString,
 75+  firstValueAsNumber,
 76   filterOutStringValues,
 77   checkArgumentsAtLeastLength,
 78   checkArgumentsLength
 79diff --git a/tests/FormulasTest.ts b/tests/FormulasTest.ts
 80index b7b6a90..d504414 100644
 81--- a/tests/FormulasTest.ts
 82+++ b/tests/FormulasTest.ts
 83@@ -11,6 +11,7 @@ import { ABS, ACCRINT, ACOS, ACOSH, ACOTH, AND, ARABIC, ASIN, ASINH, ATAN, ATAN2
 84     SUMSQ, SUMX2MY2, SUMX2PY2, TAN, TANH, TRUNC, XOR, YEARFRAC } from "../src/RawFormulas/RawFormulas"
 85 import * as ERRORS from "../src/Errors"
 86 import {assertEquals, assertEqualsDates, assertArrayEquals} from "./utils/Asserts"
 87+import {firstValueAsNumber} from "../src/RawFormulas/Utils";
 88 
 89 function catchAndAssertEquals(toExecute, expected) {
 90   try {
 91@@ -648,10 +649,23 @@ assertEquals(ROUNDDOWN(99.46, 1), 99.4);
 92 
 93 assertEquals(ROUNDUP(99.46, 1), 99.5);
 94 
 95+
 96+// Test SIN
 97 assertEquals(SIN(0), 0);
 98 assertEquals(SIN(1), 0.8414709848078965);
 99 assertEquals(SIN(PI() / 2), 1);
100 assertEquals(SIN(PI()), 0);
101+assertEquals(SIN(true), 0.8414709848078965);
102+assertEquals(SIN(false), 0);
103+assertEquals(SIN("0"), 0);
104+assertEquals(SIN(""), 0);
105+catchAndAssertEquals(function() {
106+  SIN("str");
107+}, ERRORS.VALUE_ERROR);
108+assertEquals(SIN([1]), 0.8414709848078965);
109+assertEquals(SIN([[1]]), 0.8414709848078965);
110+assertEquals(SIN([1, "str"]), 0.8414709848078965);
111+
112 
113 assertEquals(SINH(PI()), 11.548739357257752);
114