Teaching OSSSC TGT Teachers Mock Test Series 2025 Mathematics Trigonometry Trigonometric Identities

यदि a = sin-1(sin (5)) और b = cos-1 (cos(5)) है, तो a2 + b2 का मान है:

1
4π2 + 25
2
8π2 - 40π + 50
3
4π2 - 20π + 50
4
25
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