If cos θ + sec θ = k, then what is the value of sin2θ - tan2θ ? – McqOptions

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1.	If cos θ + sec θ = k, then what is the value of sin2θ - tan2θ ?
A.	4 - k
B.	4 - k2
C.	k2 - 4
D.	k2 + 2
Answer» C. k2 - 4

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