AM-2564

R-formula

A Math · Secondary 4 · Medium · R-formula

Given that

5\sin\theta+12\cos\theta=R\cos(\theta-\alpha)

, where

R>0

and

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

, what is the value of

R

?

$13$
$\sqrt{17}$
$\sqrt{119}$
$7$

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