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Sinª A cosec² A+ cos4 A sec² A = 1
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Sinª A cosec² A+ cos4 A sec² A = 1

User YuppieNetworking
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Explanation:

sin4Acosec2A+cos4Asec2A=sin2Asin4A+cos2Acos4A=sin2A+cos2A=1

User Jitender Mahlawat
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