Roboguru

Bila x terletak dalam interval maka berlaku....

Bila x terletak dalam interval straight pi over 4 less than x less than straight pi over 2 maka berlaku....

  1. cos space x space less or equal than space cos space 2 x

  2. cos space x space greater than space cos space 2 x

  3. cos space x space greater or equal than space cos space 2 x

  4. cos space x space less than space cos space 2 x

  5. cos space x space equals space cos space 2 x

Jawaban:

Interval x adalah space straight pi over 4 less than x less than straight pi over 2

Jika nilai space x equals straight pi over 3

cos space x equals cos straight pi over 3 equals 1 half  cos space 2 x equals cos fraction numerator 2 straight pi over denominator 3 end fraction equals negative 1 half

Maka : cos space x space greater than space cos space 2 x

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