If sin(θ) = 3/5, and θ is in the first quadrant, cos(θ) = A 3/5 B 4/5 C 5/3 D 3/4 ✓ Correct Answer: Option B sin²θ + cos²θ = 1 → cos²θ = 1 − 9/25 = 16/25 → cosθ = 4/5 (positive in Q1). Practice DAT Exam Prep Quizzes → Browse All Questions Study Flashcards