roberthagemanjr roberthagemanjr

16-01-2020
Mathematics

contestada

Which trigonometric function is equal to Cos 4 degrees?
A. Sin 44 degrees
B. Sin 4 degrees
C. Sin 86 degrees
D. Sin 96 degrees

Respuesta :

jimrgrant1 jimrgrant1

16-01-2020

Answer:

C

Step-by-step explanation:

Using the cofunction identity

sin(90 - x)° = cosx°, thus

cos4° = sin(90 - 4)° = sin86° → C

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