Exams › SSC CGL (Prelims) › General

If sin A = 3/5, find the value of sin^2 A + cos^2 A - 2 sin A cos A.

1. 1
2. 0
3. 1/25
4. 1/5

Correct answer: 1/25

Solution

Since sin A = 3/5, cos A = 4/5. The expression equals (sin A - cos A)^2 = (3/5 - 4/5)^2 = (-1/5)^2 = 1/25.

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