The answer is that (Sin & # 178; a + cos & # 178; a) / (Sin & # 178; a + cos & # 178; a-sinacosa) protolith can be transformed into this

Your topic is different from that just now
It turned out to be 1-1 / (sinacosa)
Now it should be transformed from 1 / (1-sinacosa)
Equal to 1 / (1-2 / 5) = 1 / (3 / 5) = 5 / 3

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