sin (45º + θ) – cos (45º

Foundation

Mathematics Foundation

Introduction to Trigonometry

Question

sin (45º + θ) – cos (45º – θ) = ?

2 sin θ

2 cos θ

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sin (45º + θ) – cos (45º – θ) = sin (45º + θ) – sin [90º – (45º – θ)]

= sin (45º + θ) – sin (45º + θ) = 0.

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