Question

Fill in the blanks .
() sin20° = cos
(1) lan30° tan
(i) cos40º = sin​

Answer 1

i. sin 20° = cos (90° – 20°) ...[∵ sin θ = cos(90 – θ)] = cos 70° ii. tan θ x tan(90 – θ) = 1 Substituting θ = 30°, tan 30° x tan(90 – 30)° = 1 ∴ tan 30° x tan 60° = 1 iii. cos 40° = sin(90° – 40°) …[∵ cos θ = sin(90 – θ)] = sin 50°Read more on Sarthaks.com - https://www.sarthaks.com/852909/fill-in-the-blanks-i-sin-20-cos-ii-tan-30-x-tan-1-iii-cos-40-sin