AM-2470

R-formula

A Math · Secondary 4 · Medium · R-formula

Solve the equation

5\sin\theta - 2\cos\theta = 4

for

0^\circ \le \theta \le 360^\circ

. (Give one principal solution.)

$70.0^\circ$ (to 3 s.f.)
$48.0^\circ$ (to 3 s.f.)
$21.8^\circ$ (to 3 s.f.)
$110.2^\circ$ (to 3 s.f.)

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