![Hg1533](/avatars/17708.jpg)
Hg1533
21.10.2019 •
Mathematics
Write as a single term: cos(2x) cos(x) + sin(2x) sin(x)
Solved
Show answers
More tips
- S Style and Beauty 5 Tips for Choosing the Best Ugg Boots...
- H Health and Medicine Boosting Immunity: A Complete Guide on How to Improve Your Body’s Natural Defenses...
- C Computers and Internet The Best Antivirus Programs for your PC...
- S Style and Beauty How to Get Rid of Acne: Scientifically Proven Methods...
- 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?...
- S Style and Beauty Intimate Haircut: The Reasons, Popularity, and Risks...
- A Art and Culture When Will Eurovision 2011 Take Place?...
- S Style and Beauty How to Choose the Perfect Hair Straightener?...
Answers on questions: Mathematics
- M Mathematics 1 0.5 1 4) Approximate S9 - x2 dx using 3 subintervals with a) Left Riemann Sum, b) Right Riemann Sum c) Trapezoidal approximation 22 decina dcubinte- LAN-...
- M Mathematics Find the sum of 2 x2 + 3 x - 4, 8 - 3 x , and -5 x2 + 2 -3 x2 - 2 -7 x2 - 2 -3 x2 + 6 -7 x2 - 6 x - 2...
- M Mathematics Analyzing Dot Plots Quiz Active TIME REMAINING 58:42 Mrs. Ramos s Class Number of Pets Which statement correctly compares the means of the data in the dot plots? The mean for...
- S Social Studies Why does theory not match reality? in economics...
- W World Languages Why does chuang tzu compare the p’eng to a cicada?...
- M Mathematics Which fraction is halfway between 1/2 and 5/6? a. 2/3 b. 4/3 c.3/5 d.7/12 and another question arrange these numbers from least to greatest: -3/7, -5/6, -3/5, and -7/9 ?...
- P Physics Are clocks permanently stuck to walls?...
Ответ:
cos(x)
Step-by-step explanation:
We have
sin ( x + y ) = sin(x)*cos(y) + cos(x)*sin(y) (1) and
cos ( x + y ) = cos(x)*cos(y) - sin(x)*sin(y) (2)
From eq. (1)
if x = y
sin ( x + x ) = sin(x)*cos(x) + cos(x)*sin(x) ⇒ sin(2x) = 2sin(x)cos(x)
From eq. 2
If x = y
cos ( x + x ) = cos(x)*cos(x) - sin(x)*sin(x) ⇒ cos²(x) - sin²(x)
cos (2x) = cos²(x) - sin²(x)
Hence:The expression:
cos(2x) cos(x) + sin(2x) sin(x) (3)
Subtition of sin(2x) and cos(2x) in eq. 3
[cos²(x)-sin²(x)]*cos(x) + [(2sen(x)cos(x)]*sin(x)
and operating
cos³(x) - sin²(x)cos(x) + 2sin²(x)cos(x) = cos³(x) + sin²(x)cos(x)
cos (x) [ cos²(x) + sin²(x) ] = cos(x)
since cos²(x) + sin²(x) = 1
Ответ:
just need the points sorry im only 13
Step-by-step explanation: