Prove that sin (theta) - cos (theta)+1/sin (theta)+cos (theta)-1 equals to 1/sec(theta)-tan(theta)

Prove that sin (theta) - cos (theta)+1/sin (theta)+cos (theta)-1 equal

1.	Prove that sin (theta) - cos (theta)+1/sin (theta)+cos (theta)-1 equals to 1/sec(theta)-tan(theta)
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