Solution

Solution

+1
Decimal Notation
Solution steps
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

2cos^2(θ)-1=02tan^2(300)+3sin^2(150)-cos^2(180)cos(2x)=-(sqrt(3))/2 ,-pi<= x<= pi/2cos(2θ)=cos^2(θ)-1/2arccos(cos((7pi)/6))

Frequently Asked Questions (FAQ)

  • What is the value of sin(225) ?

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