How many milliseconds does one second equal? 100 or 1000? It depends on It's 100 milliseconds
One second = 1000 milliseconds = 1000 microseconds = 1000 nanoseconds
How many seconds is 100 milliseconds?
1 second = 1000 milliseconds (MS) 1 millisecond = 1 / 1000 seconds (s) 1 second = 1000000 microseconds (μ s) 1 microseconds = 1 / 1000000 seconds (s) 1 second = 1000000000 nanoseconds (NS) 1 nanoseconds = 1 / 1000000000 seconds (s) 1 second = 1000000000 picoseconds (PS) 1 picoseconds = 1 / 100000000000000 seconds (s)
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How did cosa / (Sina + sin3a) = cosa / (2Sin (2a) COSA) come from
Using sum difference product formula:
sinθ+sinφ=2sin[(θ+φ)/2]cos[(θ-φ)/2]
The formula derivation (in this problem) is based on sin (3a) + Sina = sin (2a + a) + sin (2a-a) = 2sin2acosa;
Given Sina + 3cosa = 0, then 2Sin square a + 5sinacosa-7cos square a
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2Sin ^ a-cos ^ A + Sina * cosa-6sina + 3cosa = 0
How to solve this formula? It is to change it into the form of two products, such as a * b = 0?
2sin^a-cos^a+sina*cosa-6sina+3cosa=0(2sina-cosa)(sina+cosa)-3(2sina-cosa)=0(2sina-cosa)(sina+cosa-3)=0 (2sina-cosa)[√2(√2/2sina+√2/2cosa)-3]=0 (2sina-cosa)[√2(sinacosπ/4+cosasinaπ/4)-3]=0 (2sina...
How is Sina + - √ 3cosa = 2Sin (a + - π / 3) deduced,
Divide the two sides by two at the same time, and turn the left half and the left half root sign three into sin30 and cos30 respectively. Then, it's a basic trigonometric formula
Sina ^ 2 = - 2cosa, find a
I've been calculating a = 0 for a long time, but it's not right,
1-cosa^2=-2cosa
cosa^2-2cosa-1=0
cosa=±√(2)+1
Because cosa's 1
So cosa = 1 - √ (2)
How to find (1 / 2) Sina = 2-2cosa
(1/2)sinA=2-2cosA
2cosA=2-(1/2)sinA
Square of both sides, 4 (COSA) ^ 2 = {2 - (1 / 2) Sina} ^ 2
4*(1-(sinA)^2)={2-(1/2)sinA}^2
Solve the quadratic equation of one variable
sinA=0
Or Sina = 8 / 17
The inequality Sina > 1 / 2 is used to find the range of A
(30 ° and 150 °) because it is a positive value, it is in the first and second quadrants
a ∈ ( π/6 +2kπ ,5π/6 +2kπ ) k∈n