Which of the following equals cos 80°A) sin 20°B) sin 100°c) sin 10°D) sin 80°
1 answer:
Answer:
C
Step-by-step explanation:
Using the Cofunction identity
sin(90 - x)° = cos x°, hence
cos80° = sin(90 - 80)° = sin10° → C
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Step-by-step explanation:
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Step-by-step explanation:
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