AM-2674

R-formula

A Math · Secondary 4 · Medium · R-formula

The expression

7\cos\theta - 24\sin\theta

can be written in the form

R\cos(\theta+\alpha)

, where

R>0

and

0<\alpha<\frac{\pi}{2}

. What is the value of

R

?

$13$
$17$
$25$
$31$

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