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cos 12° - sin78°
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Answer:
By trigonometric identity, we can say
cos (90° - θ) = sin θ
Now, just replace θ by 78°.
We get
cos (90° - 78°) = sin 78°
⇒ cos 12° = sin 78° [∵, 90° - 78° = 12°]
Now, cos 12° - sin 78° = sin 78° - sin 78°
⇒ cos 12° - sin 78° = 0
Step-by-step explanation:
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