Post a New Question

Trig

posted by .

Evaluate and simplify cos(-15º). Hint: Substitute 30º-45º for -15º.

  • Trig -

    Well, why not follow that hint

    sin(-15) = sin(30 - 45)
    = sin30cos45 - cos30sin45
    = ....

    You should know the trig functions of those special angles.

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question