Mathematics, 22.01.2020 16:31 sihamabdalla591

Need
3. simplify the expression x^{2} -2x-3/x^{2} -3x-4÷x-3/2x

4. cos (a+b)= cosacosb-sinasinb, then cos (20+60) is what?

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Need
3. simplify the expression x^{2} -2x-3/x^{2} -3x-4÷x-3/2x

4. cos (a+b)= cosa...