Simplify sin(70)

Problem

sin(70)

Solution

1. Identify the expression as a trigonometric value in degrees.

2. Apply the cofunction identity which states that sin(θ)=cos(90−θ)

3. Substitute 70 into the identity to find the equivalent cosine value.

4. Calculate the difference 90−70=20

5. Conclude that the expression is simplified to its cofunction form, as 70 is not a standard angle with a simple radical exact value.

Final Answer

sin(70)=cos(20)

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