1.

| १०2 5n6 Sclan-e)len - गे.(७८90 -9) (७४७9 (ot (0-0)

Answer»

sec(90-A)=cosecAcosec(90-A)=cosecAcot(90-A)=tanAtan(90-A)=cot AhencesinA*cosecA*tanA/cosecAcosA*tanA-tanA/cotA=tanA/cotA*tanA-tan^2A=tanA-tan^2A



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