Answer :

Let y = cosx

Let x =60° and Δx = 1° .

As y =cos x

We, know

Δy = 0.01511


Δy = f(x+Δx)-f(x)

0.01511 = cos(60+1) – cos(60)

0.01511 = cos61° – 0.5

cos61° = 0.48489

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