odeejaber35 odeejaber35
  • 24-03-2022
  • Mathematics
contestada

Please help asap! I will gave brainlest!

Please help asap I will gave brainlest class=

Respuesta :

Аноним Аноним
  • 24-03-2022

Answer:

√2 + √6 / 4

Step-by-step explanation:

We know cos(-θ) = cosθ.

Therefore, cos(-15°) = cos15°.

cos15° = cos(45 - 30)

  • cos15° = cos45cos30 + sin45sin30
  • cos15° = (1/√2)(1/2) + (1/√2)(√3/2)
  • cos15° = 1/2√2 + √3/2√2
  • cos15° = √3 + 1 / 2√2
  • cos15° = (√3 + 1)(√2) / 4
  • cos15° = √2 + √6 / 4
  • Option 1
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