If cos2 θ – sin2 θ = tan2 ϕ, then which of the following is true? – McqOptions

MCQOPTIONS

1.	If cos2 θ – sin2 θ = tan2 ϕ, then which of the following is true?
A.	cos θ cos ϕ = 1
B.	cos θ cos ϕ = √2
C.	cos2 ϕ – sin2 ϕ = cot2 θ
D.	cos2 ϕ – sin2 ϕ = tan2 θ
Answer» E.

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