AM-2650

R-formula

A Math · Secondary 4 · Easy · R-formula

Express the function

f(x)=4\cos x+3\sin x

in the form

R\cos(x-\alpha)

, where

R>0

and

\alpha

is acute. What is the value of

R

?

$3$
$4$
$5$
$\sqrt{7}$

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