AM-2560

R-formula

A Math · Secondary 4 · Hard · R-formula

A signal voltage is given by

V = 10\cos\theta - 6\sin\theta

. It is expressed in the form

R\cos(\theta+\alpha)

, where

R>0

and

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

. What is the value of

R

?

$2\sqrt{34}$
$\sqrt{16}$
$\sqrt{64}$
$\sqrt{100-25}$

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