If θ and φ Are Each First Quadrant Angles,which of the Following

question 5

Multiple Choice

If θ and φ are each first quadrant angles,which of the following must be true if sin θ = cos φ?

• A)θ + φ = π rad
• B)θ + φ = 90°
• C)θ - φ = π/2 rad
• D)θ = φ

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