Question

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cos 50° = sin 40°



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Answer 1

Dimana cos(50°) = sin(40°), maka berlaku hubungan :

→ cos(90° - x) = sin(x) atau sin(90° - x) = cos(x)

→ cos(90° - 40°) = sin(90° - 50°)

= sin(40°)

= sin(90° - 50°)

= sin(90°)cos(50°) - cos(90°)sin(50°)

= 1.cos(50°) - 0.sin(50°)

= cos(50°) - 0

= cos(50°)

Terbukti, bahwa cos(50°) = sin(40°)