1. derive this identity from the sum and difference formulas for cosine:
sin a sin b =...
![subject](/tpl/images/cats/mat.png)
Mathematics, 16.10.2019 06:30 rodriguezzamyy
1. derive this identity from the sum and difference formulas for cosine:
sin a sin b = (1 / 2)[cos(a – b) – cos(a + b)]
calculation:
1.
2.
3.
reason:
1.
2.
3.
2. use the trigonometric subtraction formula for sine to verify this identity:
sin((π / 2) – x) = cos x
calculation:
1.
2.
3.
reason:
1.
2.
3.
![ansver](/tpl/images/cats/User.png)
Answers: 3
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Mathematics
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 22:10
Which of the following circles have their centers in the third quadrant?
Answers: 2
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 23:30
Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.
Answers: 3
You know the right answer?
Questions
![question](/tpl/images/cats/en.png)
English, 04.06.2020 15:00
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 04.06.2020 15:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 04.06.2020 15:00
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 04.06.2020 15:00
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/ap.png)
Advanced Placement (AP), 04.06.2020 15:00
![question](/tpl/images/cats/mat.png)
Mathematics, 04.06.2020 15:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
History, 04.06.2020 15:00
![question](/tpl/images/cats/fizika.png)
Physics, 04.06.2020 15:00
![question](/tpl/images/cats/mat.png)
Mathematics, 04.06.2020 15:00
![question](/tpl/images/cats/mat.png)
Mathematics, 04.06.2020 15:00