Q80. If tan θ = k, what is the value of sin(90° + θ) × cos(180° + θ)? (Given 0° < θ < 90°)Mathematics — Trignometry — Question 80 of 479A. k2 / (1 + k2)B. -k2 / (k2 - 1)C. -1 / (1 + k2)D. k / √(1 - k2)Practice more Mathematics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →