Question

Find the value of cos 570° sin 510° + sin (-330°) cos (-390°).​

Answer 1

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$\Large\fbox{\color{purple}{QUESTION}}$

Find the value of cos 570° sin 510° + sin (-330°) cos (-390°).

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$\bf\Huge\red{\mid{\overline{\underline{ ANSWER }}}\mid }$

➡️cos 570° sin 510° + sin (-330°) cos (-390°)

➡️= cos 570° sin 510° – sin 330° cos 390°

➡️= cos (540° +30°) sin (540° – 30°) – cos (360° + 30°) sin (360° – 30°)

➡️= cos 30° sin 30° – cos 30° sin 30°

➡️= 0

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