Question

please evaluate

Answer 1

...

Answer 2

\[\Phi\]

Answer 3

do it with steps please

Answer 4

srry for late

Answer 5

Alright (cos k-sink)/(cosk+sink)divide everything by cosk you get (1-tan k)/(1+tank)

Answer 6

which equals to tan(pi/4-k).So tan inverse of that I think you can solve

Answer 7

another method?

Answer 8

please tell me where m i mistakin

Answer 9

i got it I have written sin2x instead of 1+ sin2x , But still answer comes 1 ,
instead of -1 :-C