Question

without using trigonometric tables, prove that:
sin^2 12°+sin^2 78°

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Answer 1

Answer:

given sin2 12° + sin2 78°

sin2 12° + cos2(90°- 12° )

sin2 12° + cos2 12° = 1. if (sin2◆ + cos2 ◆)= 1

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