Question

sin square 20°+ sin square 70°\2(cos square 65°+cos square 21°. ) =. sec 60°\k
find the value of k ????​

Answer 1

Answer:

4

Step-by-step explanation:

(sin^2 20 + cos^2 20)/2 (cos^2 65 + sin^2 65) = sec 60/k

1 / 2 = 2/k

k = 4