COS Function - Calc Cosine of Angle - Excel, VBA, G Sheets

SOLVED: Find the 45th derivative of Y = cos(2x) f'(45)(x)

If cos x = - 45 , where x epsilon [ 0, pi], then the value of cos (x2) is equal to :

(a) Use your calculator to evaluate the expression cos72^∘ cos144^∘ . Then follow steps (b) through (d) to prove that cos72^∘ cos144^∘=-1 / 2 (b) Use the observation cos72^∘ cos144^∘=cos(108^∘-36^∘) cos(108^∘ 36^∘) and the addition formulas for cosine to show that cos72^∘ cos144^∘=2 cos108^∘ cos36^∘ (c) Use the reference-angle concept to explain why cos108^∘ cos36^∘=cos72^∘ cos144^∘ (d) Use parts (b) and (c) and the identity in Exercise 58(a) to conclude that cos72^∘ cos144^∘=-1 / 2, as required

The value of sin(45° θ) - cos(45° - θ) is ______. - Mathematics | Shaalaa.com

Value of cos ^-1 35 - sin ^-1 45 is

The value of cos 15∘cos 30∘cos 45∘cos 60∘cos 75∘/sin 10∘sin 30∘sin 50∘sin 70∘ is