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CBSE Class 10 Answered

Cosec²72° - tan²18°=1

Asked by abhishekmonupatel27 | 23 Feb, 2021, 04:31: PM
Expert Answer
To prove: cosec²72° - tan²18°=1
L.H.S = cosec²72° - tan²18°
         = cosec(90°- 18°)² - tan²18°
         = sec²18° - tan²18°
         = 1
         = R.H.S
Hence, proved.
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