Q. 233.7( 3 Votes )

Mark the correct A.




Answer :

We know tan2x + 1 = sec2x…(1)

Let tan x be a and sec x be b

According to question

a + b =k

Manipulating and Substituting in 1 we get

a2 – b2 = -1

(a-b)( a + b) = -1

(a-b).k =-1

a-b = -k-1

a + b =k

a-b = -k-1

subtracting above equations we get

2b =k +k-1

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