AM-2558

R-formula

A Math · Secondary 4 · Medium · R-formula

A ladder of length

L

metres rests against a wall. Its height above the ground is modeled by

h = 9\cos\theta + 12\sin\theta

, where

\theta

is the angle the ladder makes with the ground. Express

h

in the form

R\cos(\theta-\alpha)

. What is the value of

R

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