show that..........,,,,,,,,,,,,,,,,,,,
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=cos^2(teta)+(1-sin(teta))^2÷cos(teta)(1-sin(teta))
=cos^2(teta)+1-2sin(teta)+sin^2(teta)÷cos(teta)(1-sin(teta))
=2(1-sin(teta))÷cos(teta)(1-sin(teta))
=2÷cos(teta)
=2sec(teta)
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