2) 1-sin²L-cos²L= 0
3) (1-cosL)(1+cosL)= 1² - cos²l = 1 - cos²l = sin²l.
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2) 1-sin²L-cos²L= 0
3) (1-cosL)(1+cosL)= 1² - cos²l = 1 - cos²l = sin²l.