Question

If tan theta = 20/21, prove that Cos theta - sin theta divided by cos theta + sin theta = 1/ 41​

Answer 1

Answer:

Step-by-step explanation:

Hope it will help you.

Answer 2

tan theta = 20/21

then p/b= 20/21

p= 20

b= 21

h= 20 square + 21 squareś whol root

= 400 + 441ś whol root

= whole root of 841

= 29

so we got p, b, h

cos theta - sin theta / cos theta + sin theta

=21/29 - 20/29. / 21/29 + 20/29

= 1/29 / 41/ 29

and the 29ś are cancelled

we got = 1/41. (proved)

if you are in doubt so you can write it in your copy step by step