3 years ago

Which of the following equals cos 80°A) sin 20°B) sin 100°c) sin 10°D) sin 80°

1 answer:

6 0

Answer:

Step-by-step explanation:

Using the Cofunction identity

sin(90 - x)° = cos x°, hence

cos80° = sin(90 - 80)° = sin10° → C

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Which of the following equals cos 80°A) sin 20°B) sin 100°c) sin 10°D) sin 80°​