Sin^2 11+sin^2 79/cosec^2 20-tan^2 70
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1÷1 = 1
since sin square 79 = cos square 11
cosec square 20 = sec square 70
sin square a + cos square a = 1
sec square a - tan square a = 1
since sin square 79 = cos square 11
cosec square 20 = sec square 70
sin square a + cos square a = 1
sec square a - tan square a = 1
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