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

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


The answer is :

B. θ + φ = 90°


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