1.

Cosec2 (90°-0) - tan2 0= cos2 (90° - 0) + cos2 0​

Answer»

cosec²(90°-)-tan² = cos²(90°-)+cos²

sec²-tan² = sin²+ cos²

(1/cos²)- (sin²/cos²) = 1

(1+cos²)/(sin²) = 1

1+cos²= sin²



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