Cos² 2x = (1+cos 4x )/2
cos² 6x = (1+cos 12x)/2
subtract to get 1/2 (cos 4x - cos 12x )
= 1/2 (2 sin 4x sin 8x ) as cos A - cos B = 2 [ sin (A+B)/2 sin (A-B)/2 ]
so the answer
Hi There!
I believe the answer to the first box would be 9x. Then second box would then be 45. The first and second box would be 9x and 45 because there are 9 chairs in each row making the number of chairs total to 45 chairs. The third and final box would be x=5. The third box would equal 5 because when 9 is multiplied by 5, the answer of the equation equals 45.
I hope this helps!
Answer:
615.6
Step-by-step explanation:
14 to the power of 2 is 196
196 multiplied by pi is 615.6
Hope this helps!
Answer:
6x - 6
Step-by-step explanation:
(2x + 6) + (4x - 12) ← remove parenthesis
= 2x + 6 + 4x - 12 ← collect like terms
= (2x + 4x) + (6 - 12)
= 6x + (- 6)
= 6x - 6
