Ask Question
12 October, 09:33

Sin78 * cos42+cos78*sin42 evaluate without the use of a calculator

+1
Answers (1)
  1. 12 October, 11:22
    0
    Sin a * cos b + cos a * sin b=sin (a+b)

    sin 78 * cos 42 + cos 78 * sin 42=sin (78+42) = sin 120=sin (180-120) =

    sin 60=√3 / 2

    Answer: sin 78 * cos 42 + cos 78 * sin 42 = √3 / 2
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “Sin78 * cos42+cos78*sin42 evaluate without the use of a calculator ...” in 📘 Mathematics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers