Estelle5656 Estelle5656
  • 20-11-2019
  • Mathematics
contestada

Find the value for a that makes sins=cos25

Respuesta :

22miles 22miles
  • 20-11-2019

Answer:

Ans: 0.766

Step-by-step explanation:

Use the trig identity: cos (a + b) = cos a,cos b - sin a.sin b

cos (25 + 15) = cos (40) = cos 25.cos 15 - sin 25.sin 15.

The arc

40

∘

doesn't have exact functional value.

You may get its approx. value by calculator.

cos 40 = 0,766

Answer Link

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