Trigonometry hand trick

           Trigonometry Hand tricks

1) take sinA to thumb side and cosA to little finger side.

2)angles on fingers

              Thumb=0°

               Index finger=30°

               Middle finger=45°

               Ring funger = 60°

               Little ginger=90°

3) fold that finger of which you want to find the value.

4) take a square root of a fingers which remains of side to sinA & cosA and divide it by 2.

5)you get the values of sinA & cosA of 0°,30°,45°,60°and 90°.

Example:-

            1) value of sin60° & cos60°

            2) fold the finger of 60°

            3) now 3 fingers remains to side of sin and 1

finger remains to side of cos.

           4) now take the square root of 3 & 1 I.e. √3 and 1 respectively and divide it by 2, then we get the values sin60°=√3/2 and cos60°1/2.

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Thank you.