Question

if x = sec∅+ tan∅, then the value of (x +1/х) is​​

Answer 1

x=sec@+tan@
1/x = 1/sec@+tan@
Rationalising the dr then
sec@-tan @/sec^2@-tan^2@
We know sec^2@-tan^2@=1
1/x= sec@- tan @
x+1/x= sec @+tan @+sec@- tan@=2sec@