Easy trick to find the value of sin cos tan up to 90 degree

Easiest way to remember to values of sin a, cos a, tan a, cot a, sec a, cosec a up to 90 (i.e. 0, 30, 45, 60 and 90 degrees) degree is described here:

First Step: 

Write down degrees:   0     30      45      60     90

write 0 under 0, 1 under 30, 2 under 45, 3 under 60 & 4 under 90.

divide 0, 1, 2, 3, 4 by 4

find the root of the each

and this is the value of sin 0, 30, 45, 60 and 90 degrees

The same has been shown in the below image.


Simplifying this you will get these values of sin a and cos a:-


When you all get value of sin a and cos a then you can find the values of all other trigonometric ratios by these formulas:

tan a = sin a/ cas a

cot a = cos a/ sin a

sec a = 1 / cos a

cosec a = 1 / sin a

by doing this you all will get values off tan a , cot a, sec a & cosec a as follows:


Now you all can easily remember exact values of sin a, cos a, tan a, cot a, sec a, cosec a upto 90 degrees for lifetime.

Learn this trick from video CLICK HERE TO WATCH


for any queries/ doubts please comment

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