a) cosA . cosecA . tanA = 1. -
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Solution:
→ cosA × cosecA × tanA
→ cosA × 1/sinA × tanA ... (cosecA = 1/sinA)
→ cotA × tanA ... (cosA/sinA = cotA)
→ 1/tanA × tanA ... (cotA = 1/tanA)
→ 1
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