sec (4x – 50°) = sec (50° – x) ⇒ sec (4x – 50°) = sec (90° – (50° – x)) = sec (40° + x) ⇒ 4x – 50° = 40° + x ⇒ 4x – x = 50° + 40°⇒ 3x = 90°
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