engineering mathematics MCQ #5571

The expression cos(x)cos(y) - sin(x)sin(y) simplifies to

engineering mathematics MCQ #5571

  1. Question 1

    Q1. The expression cos(x)cos(y) - sin(x)sin(y) simplifies to

    • A) cos(x + y)
    • B) cos(x - y)
    • C) sin(x + y)
    • D) sin(x - y)

    Answer: cos(x + y)

    Explanation: Using the cosine sum identity, the expression simplifies to cos(x + y).