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Trigonometric Formula

Akhilesh Choudhary
06/03/2017 0 0

We will learn how to remember the trigonometric Formula in different quadrants.

1. Quadrant 1-(0° to 90°) - All functions  are positive

2. Quadrant 2-(90° to 180°) - Sine & Cosec functions  are positive

3. Quadrant 3-(180° to 270°) - Tan & cot functions  are positive.

4. Quadrant 4-(270° to 360°) - Cos & Sec functions  are positive

Now, Even Degree + angle = Same function 

             And 

Odd Degree + angle = Opposite function 

For Eg. Sine(180+x)= -Sinx as 180+x lies in 3rd quadrant where all are negative except tan & cot

Eg . Sine(270+x) = Cosx as 270 +x lies in 4th quadrant and 270 is an odd Degree ,so the opposite angle is cosine.

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