- Help condense expression please!?

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The sun orbit of a spacecraft has perihelion distance 1 AU and aphelion distance 4 AU. What is the length of semi-major axis of orbit in AU? Use linear approximation to estimate sin(35) Leave your answer in terms of pi. NO decimals in answer? Tan30+tan15/tan30.tan15-1=-1? Why do metallic atoms lose electrons and become positive ions when ionic bonds are formed? 2x^2-4x+3. Find where the tangent line is horizontal, parallel to the line given by y=2x+1 and perpendicular to the line given by y =2x+1?