Question

if tan theta equals to 20 by 21 then cos theta minus sin theta by cos theta + sin theta equals to​

Answer 1

tan∅= 20/21

p/b= 20/21  

by pythageorus theorem u get h= 29

then

cos∅= p/h      sin∅=b/h

= 20/29           = 21/29

cos∅ - sin∅/cos∅+sin∅=

21/29-20/29 / 21/ 29+ 20/29

= 1/29/ 31/29

= 1/31