Question 108

sin (45 + θ) - cos (45 - θ) is

Expression : sin (45 + θ) - cos (45 - θ)

= $$sin [90 - (45 - \theta)] - cos (45 - \theta)$$

$$\because cos (90 - \theta) = sin \theta$$

= $$cos (45 - \theta) - cos (45 - \theta)$$

= 0

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