evaluate: cos(40+ A) - sin(50 - A) + cos²40 + cos²50/sin²40 + sin²50
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ans is 0.44 as u'll get sin(50-A)-sin(50-A)+cos²50/cos²50+sin²50+sin²50 equals 1+2sin²50 equal 1- 0.56 equals 0.44
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