THE Department of Agriculture (DA) and the Philippine Competition Commission (PCC) want the National Food Authority (NFA) to regain the functions it lost when the Rice Tariffication Law (RTL) took ...
Sec(a-b) = cos(a+b) / cos^2a - sin^2b I'm trying to prove this, by turning the left side into the right. I am stuck. Presumably you have already done the sum and difference formulas for sin and cos.
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