find value sin18/cos72
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here see
sin (90 - θ) = cosθ
now apply this formula
sin18° = sin (90 - 72)
= cos72°
so cos72°/cos72° = 1
sin (90 - θ) = cosθ
now apply this formula
sin18° = sin (90 - 72)
= cos72°
so cos72°/cos72° = 1
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hope it's help you dear
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