AM-2525

R-formula

A Math · Secondary 4 · Hard · R-formula

Given that the height of a point above the ground is modeled by

h = 5\cos\theta + 12\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

R

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