Question

Which one of the following is not equal to unity?

विकल्प

• sin²x + cos²x

• cot²x – cosec²x

• sec²x – tan²x

• tan x ⋅ cot x

Answer 1

cot²x – cosec²x

Explanation:

As, cot²x – cosec²x = –1

So it is not equal to unity.