cosA.cosecA-sinA.secA/cosA+sinA=cosecA-secA
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cos.1/sin-sin.1/cos/cos+sin
cos/sin-sin/cos/cos+sin
cos2a+sin2a/sincos/cos+sin
cos+sin
cos/sin-sin/cos/cos+sin
cos2a+sin2a/sincos/cos+sin
cos+sin
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