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"Simplify and with the sourcr in the \\( \\frac { \\cos \\theta } { 2 } \\times \\frac { 5 } { - 8 } = ( - 1 ) ^ { 4 } \\times 5 ^ { 4 } = 5 \\)\nUsing the identity. Find \\( ( 2 x + 3 y ) ^ { 2 } \\) )\nAn item marked at 7.870 is sold for \\( z \\). The is the curcent ad\nAn itern marked at 7.890 is sold for 2.71 . What is the curres?\ndiscount \\( \\% \\) (d) \\( 8 \\left( b ^ { 3 } + 3 \\right) + 5 \\) ? \\( \\quad \\begin{array} { l l } { m + 1 + 5 = 7 } & { \\text { - } } \\\\ { \\text { Find } n + 50 \\text { thit } ( - 3 ) ^ { n + 1 } \\times ( - 3 ) ^ { 5 } = ( - 3 ) ^ { 7 } . } & { \\text { WhARKS } } \\end{array} \\)"
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Q1
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Q4
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