Mathematics
Evaluate:
sec2 18° - cosec2 72°
Trigonometric Identities
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Answer
sec2 18° - cosec2 72°
= sec2 (90° - 72°) - cosec2 72°
= cosec2 72° - cosec2 72°
= 0
Hence, sec2 18° - cosec2 72° = 0.
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Evaluate:
sec2 18° - cosec2 72°
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sec2 18° - cosec2 72°
= sec2 (90° - 72°) - cosec2 72°
= cosec2 72° - cosec2 72°
= 0
Hence, sec2 18° - cosec2 72° = 0.
Answered By
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