AM-2646

R-formula

A Math · Secondary 4 · Medium · R-formula

The function is given by

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

, where

x

is in degrees. Express

f(x)

in the form

R\sin(x+\alpha)

, where

R>0

and

0^\circ<\alpha<90^\circ

. What is the value of

R

?

$3$
$4$
$5$
$\sqrt7$

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