railway RRB Technician Grade 1 Mock Test 2024 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

यदि p = a sin x + b cos x तथा q = a cos x - b sin x हो, तो p2 + q2 किसके बराबर है?

1
a + b
2
ab
3
a2 + b2
4
a2 - b2
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