Q14 of 118 Page 5

Mark the correct alternative in the following:
is true if and only if

First of all we need to check the condition on x

If x = 0 then sec²x attains to infinity, so that condition must be true i.e x should not be zero

Again if x+y =0 then the RHS part becomes infinity so that condition must be true i.e. x+y should not be zero.

∴ Option B is the correct answer.

Mark the correct alternative in the following:

If , then cos x is equal to

Mark the correct alternative in the following:

If , then tan x =

Mark the correct alternative in the following:

If x is an acute angle and , then the value of is

Mark the correct alternative in the following:

The value of sin² 5° + sin² 10° + sin² 15° + … + sin² 85° + sin² 90° is