January 2019 0 76 Report
Nilai Dari Cos 15 adalah
a. 1/4 *Akar 3*(1 +*akar 2)
b. 1/4 *Akar 2*(1 +*akar 3)
c. 1/2 *Akar 3* (1/2 + 1/2 *Akar 3*)
d. 1/2 (*Akar 2*+*Akar 3*)
e. 1/3 (*Akar 2*+ *Akar 3*)
Tunjukan cara pengerjaannya.

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