AM-2535

R-formula

A Math · Secondary 4 · Medium · R-formula

The height of a wave is modeled by

H = 7\cos\theta - 24\sin\theta

. Express

H

in the form

R\cos(\theta+\alpha)

, where

R>0

and

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

. What is the value of

\alpha

correct to 1 decimal place?

$73.7^\circ$
$16.3^\circ$
$73.0^\circ$
$16.0^\circ$

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