learn trignometric table

1.write 0,30,45,60,90 in 1st row
2.sin,cos,tan in column 
3. write 0,1,2,3,4 in front of sin under respective column of step 1
4. divide the step 3 values by 4 
5. take under root of step 4

Cos is reverse of sin [start from right of sin values

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