AM-983

R-formula

A Math · Secondary 3 · Hard · R-formula

Given that

D = 6\sin\theta + 8\cos\theta

, express

D

in the form

R\cos(\theta - \alpha)

, where

R>0

and

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

. What is the value of

R

?

$5$
$10$
$\sqrt{52}$
$\sqrt{28}$

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