Question

xi)
(sino + coseco)2 + (cose +
(coso + seco)? =
tan20 + cot20 + 7​

Answer 1

Answer:

here is ur answer

Step-by-step explanation:

L.H.S = (sino+coseco)² + (coso+seco)². (:•(a+b)²=a²+b²+2ab)

» = sin²o+cosec²o+2.sino.coseco + cos²o+sec²o+2.coso.seco

= (sin²o+cos²o)+2.sino.1/sino+cosec²o+sec²o+2.coso.1/coso.

=1+2+2+cosec²o+sec²o

=5+1+tan²o+cot²o+1

=7+tan²o+cot²o

hence proved//

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