Cos 43 ° cos 77 ° + sin 43 ° sin 167 ° =? It is better to have a process

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• 1. 00356 (accurate to 0.0001)
• 2. What degree is cos30 = sin
• 3. How can 888888 multiply 888888 by 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 I'll explain it
• 4. How many decimeters does 0.1 equal to? 0.1 = how many decimeters = () decimeters
• 5. Three quarters of a kilometer is equal to one fourth of a kilometer. What's five seventh of an hour?
• 6. The number of people in class 61 is 3 / 20 more than that in class 62. If three people are transferred from class 61 to class 62, the number of people in the two classes is exactly the same. How many people are there in the two classes?
• 7. The number of students in class 61 is 1-5 more than that in class 62. In class 61, boys are 1-4 more than girls. In class 62, girls are 1-8 less than boys?
• 8. The number of class 61 is four fifths of that of class 62, which is less than that of class 62 ()
• 9. Class 51 boys account for 56% of the class. There are 50 students in the class. How many boys are there?
• 10. There are 16 boys and 14 girls in class 6 (1), and 19 girls and 14 boys in class 6 (1). How many students are there in class 6 (1)?
• 11. The value of equation 1-2sin30 ° and cos30 ° is___ ．
• 12. I would like to ask you the next math problem sin 30 ° cos 30 ° - Tan 45 ° will be able to say it, thank you everyone 4x
• 13. cos20°+cos40°+cos80°=______
• 14. Sin95 degree sin35 degree + cos95 degree cos35 degree
• 15. What degree of COS is equal to 0.943
• 16. What degree of COS is equal to 0.32
• 17. If sin (a + π / 4) = 1 / 3, then cos (π / 4 + a) is equal to
• 18. If cos θ = - 1213, θ∈ (π, 3 π 2), then the value of COS (θ + π 4) is equal to______ ．
• 19. What degree is cos α equal to 0.8
• 20. Sin angle = 3 / 5, angle in (Pie / 2, pie), find cos angle equal to