Evaluate Sin 20° - Cos70°
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sin 20° - cos 70°
sin 20° - sin ( 90° - 70° )
sin 20° - sin 20°
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0
Step-by-step explanation:
Given: Sin 20° - Cos 70°
Either convert Sin to Cos... or Cos to Sin,
Here I'm converting Sin to Cos....
¹ Sin (90° - 70°) - Cos 70°
Cos 70° - Cos 70°
= 0
.
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