Question
determine the exact value of cos121 degres cos59-sin121sin59
Answers
GPT 3.5
To find the exact value of cos(121)cos(59) - sin(121)sin(59), we can use the trigonometric identity:
cos(a-b) = cos(a)cos(b) + sin(a)sin(b)
Therefore:
cos(121)cos(59) - sin(121)sin(59) = cos(121-59) = cos(62)
Therefore, the exact value of cos(121)cos(59) - sin(121)sin(59) is equal to cos(62).
cos(a-b) = cos(a)cos(b) + sin(a)sin(b)
Therefore:
cos(121)cos(59) - sin(121)sin(59) = cos(121-59) = cos(62)
Therefore, the exact value of cos(121)cos(59) - sin(121)sin(59) is equal to cos(62).