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djyliett [7]
3 years ago
8

Solve for θ. sinθ = cos(θ+10)a. 6°b.66°c.84°d.40°​

Mathematics
1 answer:
Akimi4 [234]3 years ago
4 0

Answer:  d. 40°

<u>Step-by-step explanation:</u>

Use the Cofunction Identity:    sin Ф = cos (90° - Ф)

sin Ф = cos (Ф + 10) = cos (90° - Ф)

⇒                   Ф + 10 = 90 - Ф

                   2Ф + 10 = 90

                          2Ф  = 80

                             Ф = 40

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