Question

if Cos A = to 2 by 5 then find the value of 4 + 410 squared

Answer 1

Your question is not proper.
But according to the attachment
sin @+cos @=√2
Squaring both sides
sin^2 @+cos ^2 @+2.sin@cos@=2
=>[email protected]@=1
Now, tan@+cot@=sin@/cos@+cos@/sin@
=(sin^2@+cos^2@)/sin@cos@
=>1/sin@cos@=1
Hope it helps