Register
Find an exact value. cos 75Á
116k views
4 votes
Find an exact value.

cos 75Á

User Jgr
by
8.7k points

1 Answer

4 votes
Use formula
cos(A + B) = cos A cos B − sin A sin B


cos(75^o) \\ cos((45^o+30^o)) \\ cos(45^o)cos(30^o)-sin(45^o)sin(30^o) \\ ( √(2) )/(2) * ( √(3) )/(2)-( √(2) )/(2) * (1)/(2) \\ ( √(6) )/(4) -( √(2) )/(4) \\ ( √(6)- √(2) )/(4) \\ ( √(2)√(3)- √(2) )/(4) \\ ( √(2)(√(3)- 1 ))/(4)
User Trzczy
by
8.9k points
← Prev Question Next Question →

Related questions

User TwoTimesAgnew
asked Apr 14, 2017 11.7k views
Find all polar coordinates of point P = (9, 75Á).
TwoTimesAgnew asked Apr 14, 2017
by TwoTimesAgnew
7.9k points
1 answer
2 votes
11.7k views
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers

Other Questions

What is .725 as a fraction
How do you estimate of 4 5/8 X 1/3
A bathtub is being filled with water. After 3 minutes 4/5 of the tub is full. Assuming the rate is constant, how much longer will it take to fill the tub?
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
A dealer sells a certain type of chair and a table for $40. He also sells the same sort of table and a desk for $83 or a chair and a desk for $77. Find the price of a chair, table, and of a desk.
Link Copied!