Question

please answer this very very urgent exam please

Answer 1

Answer:

Step-by-step explanation: x= seca/2

1/x= tana/2

2( x^2 -1/x^2)

2[(seca /2)^2 -(tana/2)^2]

2[sec^2 a-tan^2 a/4]

2[1/4].           ( Since sec^2a-tan^2a=1)

2*1/4

=> 1/2