can anyone tell me what 5 t at h stands for? and also stuck with 10 = p b
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1 M and H D
3h + 20 - h + 5 = 2h + 25
If t=1, then 5t = 5 and 5t + 5 = 10
sin(t) = 2/3 sin2(t) + cos2(t) = 1 so cos(t) = ± sqrt[1 - sin2(t)] but because t is in the first quadrant, cos(t) > 0 so cos(t) = + sqrt[1 - sin2(t)] = sqrt[1 - 4/9] = sqrt[5/9] = sqrt(5)/3 Then sec(t) = 1/cos(t) = 1/sqrt(5)/3 = 3/sqrt(5) = 3*sqrt(5)/5