Use a calculator to decide whether the statement is true or false.
-sin (180°+ 225°)= sin 180° · cos 225° + cos 180° · sin 225°

Name: Use a calculator to decide whether the statement is true or false. -sin (180°+ 225°)= sin 180° · cos 225° + cos 180° · sin 225°
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Quizplus · Accepted Answer

This statement is true because it is an application of the sum formula for sine: sin(A + B) = sinA cosB + cosA sinB, where A = 180° and B = 225°.

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