meredith48034 meredith48034

26-08-2020
Mathematics

contestada

solve for θ. sinθ = cos(θ+10)

a. 6°
b.66°
c.84°
d.40°

Respuesta :

tramserran tramserran

26-08-2020

Answer: d. 40°

Step-by-step explanation:

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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