If seco + tano = 1, sino=
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Step-by-step explanation:
lhs:seco(1−sino)(seco+tano)
=[sec o-sino*seco][seco+tano][seco−sino∗seco][seco+tano]
= [sec o-tano][seco+tano][seco−tano][seco+tano]
= sec^2o-tan^2osec
2
o−tan
2
o
=1
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