Question: How can I solve these questions with explanations? 2. Determine the value of 2(sin 45')(cos45*) - 4(sin 30)(cos60) by substituting in the exact special angle

How can I solve these questions with explanations?

2. Determine the value of 2(sin 45')(cos45*) - 4(sin 30")(cos60) by substituting in the exact special angle values. 4. Calculate the value of x to the nearest tenth. 11 36 16 5. Calculate the value of 0 to the nearest degree. 27 19 13 12. For what value(s) of k does the equation 5x2 - kx + 5=0 have no roots

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