# Cos math formula

They are equal to 1 divided by cos, 1 divided by sin, and 1 divided by tan: Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9 Question 10 ## Sine, Cosine, Tangent

cos A = Adjacent side/Hypotenuse = AC/AB tan A = Opposite side/Adjacent side = BC/AC We can derive some other sin cos tan formulas using these definitions of sin, cos, and tan functions. We know that sin, cos, and tan are the reciprocals

622+ Math Experts
70549+ Happy Students  ## Cosine (cos) function

Cosine Formula From the definition of cos, it is now known that it is the adjacent side divided by the hypotenuse. Now, from the above diagram, cos α = AC/AB

## The Law of Cosines

The Law of Cosines says: c2 = a2 + b2 − 2ab cos (C) Put in the values we know: c2 = 82 + 112 − 2 × 8 × 11 × cos (37º) Do some calculations: c2 = 64 + 121 − 176 × 0.798. More calculations: c2

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## Summary of trigonometric formulas

0. Cos 360°. 1. cos 2 (α) + sin 2 (α) = 1. cos α = 1/sec α. cos (−α) = cos (α) arccos (cos (α)) = α + 2kα [where k=integer] Cos (2α) = cos 2 (α) − sin 2 (α) cos (α) =