Sin ∆ = cos ∆ Sin ∆ / cos ∆ = 1 Tan ∆ = 1Tan ∆ = tan π/4∆ = π/4
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Sin ∆ = cos ∆
Sin ∆ / cos ∆ = 1
Tan ∆ = 1
Tan ∆ = tan π/4
∆ = π/4