Which expression is equivalent to cos (70°)? Cos ^-1 (20) Sin ^-1 (20) Cos (20) Sin (20)

asked Nov 20, 2021 227k views

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Which expression is equivalent to cos (70°)?

Cos ^-1 (20)

Sin ^-1 (20)

Cos (20)

Sin (20)

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4 votes

Answer:

sin20°

Explanation:

Using the cofunction identity

cosx = sin(90 - x) , thus

cos70° = sin(90 - 70)° = sin20°

SnelleJelle answered Nov 25, 2021

6.5k points

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