Q. 105.0( 1 Vote )
find the approxim
Answer :
Let y = cosx
Let x =60° and Δx = 1° .
As y =cos x
⇒ 
We, know
⇒ 
∴ 
⇒ 
⇒ 
∴ Δy = 0.01511
Also,
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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