2sin(45°+Θ).sin(45°-Θ) = cos²Θ -sin²Θ | Prove | Trigonometric Ratios of Compound Angles | Trigonometry | Sci-Pi

Prove that: 

2sin(45°+Θ).sin(45°-Θ) = cos^2 Θ -sin^2  Θ

Answer:

This question is similar to the one we just posted previously. You need to know the formulas for expanding the compound angles and then you can easily solve such questions in Trigonometry of Mathematics.

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