How to Use Sin Cos Tan on Calculator - Trigonometric Functions Guide

Overview

Trigonometric functions describe the relationships between angles and sides of right triangles. A scientific calculator supports three basic trigonometric functions:

sin (sine): Ratio of opposite side to hypotenuse
cos (cosine): Ratio of adjacent side to hypotenuse
tan (tangent): Ratio of opposite side to adjacent side

Trigonometric functions are widely used in physics, engineering, navigation, and signal processing.

Syntax

                
sin(angle)    // Calculate sine of an angle

cos(angle)    // Calculate cosine of an angle

tan(angle)    // Calculate tangent of an angle

Note: The angle unit depends on the current mode (DEG for degrees, RAD for radians)

Examples

Example 1: Calculate sin(30°)

Mode: DEG

Input: sin(30)

Result: 0.5

Example 2: Calculate cos(π/3)

Mode: RAD

Input: cos(pi/3)

Result: 0.5

Example 3: Calculate tan(45°)

Mode: DEG

Input: tan(45)

Result: 1

Example 4: Combined calculation

Input: sin(30) + cos(60)

Result: 1

First calculate sin(30)=0.5 and cos(60)=0.5, then add them

Important Notes

Make sure the angle mode is correct (DEG for degrees, RAD for radians)
tan(90°) is mathematically undefined, the calculator will return an error or very large value
Always use parentheses when entering functions, like sin(30) not sin30
Range of values: sin and cos return values between [-1, 1], tan can be any real number

Overview

Syntax

Examples

Important Notes

Related Topics