Prove that (sinteta+coseteta)^2+(costeta+secteta)^2=7+tan^2teta+cot^2t

1.	Prove that (sinteta+coseteta)^2+(costeta+secteta)^2=7+tan^2teta+cot^2teta.
Answer» In 1st line it will. be (sin +cosec)^2

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