AM-894

R-formula

A Math · Secondary 3 · Medium · R-formula

Express

3\sin\theta+4\cos\theta

in the form

R\sin(\theta+\alpha)

, where

R>0

and

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

. What is the value of

R

?

5
$\sqrt{7}$
$\sqrt{13}$
1

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