turtle12102
20.07.2019 •
Mathematics
What is the exact value of cos 105 degrees?
Solved
Show answers
More tips
- S Style and Beauty How to Grow Hair Faster: Real Methods and Advice...
- F Family and Home How to Remove Fading from Clothes: Tips and Tricks...
- F Food and Cooking How to Make Polendwitsa at Home?...
- F Family and Home Parents or Environment: Who Has the Most Influence on a Child s Upbringing?...
- P Philosophy Unbelievable stories of encounters with otherworldly forces...
- L Leisure and Entertainment How to Choose the Perfect Gift for Men on February 23rd?...
- H Health and Medicine How to Treat Whooping Cough in Children?...
- H Health and Medicine Simple Ways to Lower Cholesterol in the Blood: Tips and Tricks...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
Answers on questions: Mathematics
- M Mathematics The width of the room is 15 feet and the length is 20 feet. they want to see how the area will be affected if the length is reduced by f feet....
- M Mathematics Anumber cube has faces labeled 1 - 6. what is the probability of rolling a 2 on the number cube and landing on a 4 on this spinner? on the spinner there is a 6,2,4,4,4,4...
- M Mathematics Me solve these 2 questions that s shown in this picture...
- M Mathematics 3packs of soda cost $10 less than 5 packs of soda. write an equation that models this....
- M Mathematics Use the three steps to solve the problem. a local train leaves a station and runs at an average rate of 35 mph. an hour and a half later an express train leaves the station...
- M Mathematics Two nearby towns have a population of 442,680 and 564,943. what is the total population of both towns...
- M Mathematics Find x. 4 ft 2.4 ft х x = ft...
- M Mathematics Hii guys what do your future dream mine is pilot&& free point want talk...
- M Mathematics Here is a right angled triangle. ABC AB is (a+5)cm BC is (2a)cm AC is (a+7)cm Calculate the value of the perimeter of the triangle. Give your answer as a whole number in...
- M Mathematics Plz help me! will mark brainliest!...
Ответ:
First, split the angle into two angles where the values of the six trigonometric functions are known. In this case, 105, can be split into 45+60 (cos (45+60))
Use the sum formula for cosine to simplify the expression. The formula states that cos (A+B) = - (cos (A) cos (B) + sin (A) sin (B)).
The exact value of cos(60) is 1/2. So multiply 1/2 to cos (45) - sin (60) times sin (45).
The exact value of cos (45) is the square root of 2 over 2
(1/2) ⋅ (√2/2) - sin (60) ⋅ sin (45)
Value of sin (60) is √3/2
(1/2) ⋅ (√2/2) - √3/2 ⋅ sin (45)
exact value of sin (45) is √2/2
(1/2) ⋅ (√2/2) - √3/2 ⋅ √2/2
all that equals √2/4 - √6/4
Ответ:
Maggie has 1/2 of a pumpkin pie. She gets another 1/2 of a blueberry pie how much pie does she have