HaPow2743 HaPow2743

08-09-2020
Mathematics

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Which expression is equivalent to cos (70°)?

Cos ^-1 (20)

Sin ^-1 (20)

Cos (20)

Sin (20)

Respuesta :

jimrgrant1 jimrgrant1

08-09-2020

Answer:

sin20°

Step-by-step explanation:

Using the cofunction identity

cosx = sin(90 - x) , thus

cos70° = sin(90 - 70)° = sin20°

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