Which expression is identical to (1 - sintheta)(1 + sintheta)?

  1. cos^2theta
  2. 1
  3. sin^2theta
  4. 1 - sintheta
Answer

A) cos^2theta

Using sin^2theta + cos^2theta = 1 and the definitions of the ratios, (1 - sintheta)(1 + sintheta) = cos^2theta. SLO M-09-B-23 · Knowledge

Mathematics MCQ · More Trigonometric Identities MCQs · Practise