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Ghella [55]
4 years ago
5

Use a cofunction identity to rewrite cos(120° − (30° + a)).

Mathematics
1 answer:
elena55 [62]4 years ago
5 0

Answer:

sina

Step-by-step explanation:

Using the cofunction identity

cos(90 - x) = sinx , then

cos(120 - (30 + a) )

= cos(120 - 30 - a)

= cos(90 - a)

= sina

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