Question

acostheta-bsintheta=c.
Prove that:
asintheta+bcostheta=+- underroot a²+b²-c
$a \cos(theta) - b \sin(theta) = c. \: prove \: that \: a \sin(theta) + b \cos(theta) = + - \sqrt{ {a}^{2} + {b}^{2} {c}^{2} }$
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Answer 1

EXPLAINED CLEARLY IN THE PICTURE

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