Cos 300° + Sin 210° =​

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Cos 300° + Sin 210° =​

Trigonometri

cos (360° – a) = cos a

sin (180° + a) = – sin a

cos 300° + sin 210°

= cos (360 – 60)° + sin (180 + 30)°

= cos 60° – sin 30°

= 1/2 – 1/2

= 0

Jawaban:

0

Penjelasan dengan langkah-langkah:

begin{aligned} cos(300 degree) + sin(210 degree) &= frac{1}{2} + left( - frac{1}{2} right) \ & = frac{1}{2} - frac{1}{2} \ & = bold{0} end{aligned}