Ximpledu

Trigonometric Function Value

See how to find the trigonometric function value
(sine, cosine, tangent).
4 examples and their solutions.

Trigonometric Function Value: Sign

How to Find the Sign

Draw the above figure
and draw the terminal side.
Quadrant I: sin, cos, tan are all (+).
Quadrant II: sin is (+). (cos, tan: (-))
Quadrant III: tan is (+). (sin, cos: (-))
Quadrant IV: cos is (+). (sin, tan: (-))

Sine Value

Example

sin π6
Solution

Example

sin 4
Solution

Mostly Used Sine Values

x 0 π6 π4 π3 π2
sin x 0 12 22 32 1

Cosine Value

Example

cos 3
Solution

Mostly Used Cosine Values

x 0 π6 π4 π3 π2
cos x 1 32 22 12 0

Tangent Value

Example

tan 11π6
Solution

Mostly Used Tangent Values

x 0 π6 π4 π3 π2
tan x 0 13 1 3 -