Solution

Solution

+1
Decimal Notation
Solution steps
Use the following property:
Rewrite using trig identities:
Write as
Use the Angle Sum identity:
Use the following trivial identity:
periodicity table with cycle:
Use the following trivial identity:
periodicity table with cycle:
Use the following trivial identity:
periodicity table with cycle:
Use the following trivial identity:
periodicity table with cycle:
Simplify

Popular Examples

arctan(2/(2sqrt(3)))cos(450)sec(-(3pi)/4)arcsec(3)2sin(15)cos(15)

Frequently Asked Questions (FAQ)

  • What is the value of cos(-225) ?

    The value of cos(-225) is -(sqrt(2))/2