Krishna
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Step 1: Know about the unit circle

NOTE: Any point on the unit circle will be a distance of one unit from the center

this is the definition of the unit circle.

• The terminal side of an angle \theta in standard position intersects the unit circle at (\cos \theta, \sin \theta).
• Another thing you can see from the unit circle is that the values of sine and cosine will never be more than 1 or less than –1.

Step 2: Use the unit circle properties to find the trigonometric ratio.

NOTE:  The terminal side of an angle \theta in standard position intersects the

unit circle at (\cos \theta, \sin \theta).

Since the terminal side of  \theta intersects the unit circle

at (\frac{3}{5},\frac{4}{5}) = (\cos \theta, \sin \theta)

Therefore, \cos\theta=\frac{3}{5}