April 2019 1 26 Report
Tunjukkan bahwa:
a) 2 sin (pi/4 + a) cos (pi/4 - a)= 1 + sin 2a
b) 2 cos (x derajat + 105 derajat) sin (x derajat + 75 derajat) = - (1/2 + 2x derajat)
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