SOLUTION: Simplify completely: 1 - 2sin^2 (50˚)

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Question 1180317: Simplify completely: 1 - 2sin^2 (50˚)
Found 2 solutions by MathLover1, greenestamps:
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

1+-+2sin%5E2%2850%29......... sin%5E2%2850%29=0.586824
=1+-+2%280.586824%29
=1+-+1.173648
=+-+0.173648

Answer by greenestamps(13203) About Me  (Show Source):
You can put this solution on YOUR website!


What does "simplify" mean for an expression like this?

The other tutor EVALUATED the expression, which is one possible interpretation of your post.

Another possible interpretation is using the double angle formula for cosine:

cos(2x)=1-2sin(x)^2

1-2sin(50)^2 = cos(100)