RRB NTPC Mains or Stage 2 Model Paper 6 with solutions

Question : 17 of 119

Marks: +1, -0

The expression

sin^2 x + cos^2 x – 1 = 0

is satisfied by how many values of x?

Solution:

sin^2 x + cos^2 x – 1 = 0⇒ sin^2 x + cos^2 x = 1

which is an identity of trigonometric ratio and always true for every real value of x.Therefore, the equation has an infinite solution.

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