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Solve to find sin x , 4cos^2 + 7sin x -7 =0

4cos 2 x + 7 sinx - 7 =0 we know that sin 2 + cos 2 = 1 so 4(1-sin 2 x) + 7sinx -7 = 0 if we times out the brackets -4sin 2 x + 7 sinx -3 =0 4sin 2 x -7sinx +3 =0 (4sinx-1)(sinx +2)=0 so therefore sinx =1/4 ...
JP
Answered by Jo P. • Maths tutor
4155 Views

Find a and b (both real) when (a+b*i)^2=i.

Every complex number has a real and imaginary part. For the complex number z=a+bi the notation for real and imaginary parts respectively are Re(z)=a and Im(z)=b . If you know this, many complex algebra equat...
UA
Answered by Urte A. • Maths tutor
1987 Views

What is the difference between "Der braune Hund gehört dem Mann." and "Der braune Hund gehört zu dem Mann."?

Let's start with the first sentence: "Der braune Hund gehört dem Mann." Translation: The man (a specific man since the definite article (indefinite: einem Mann) is used) owns the brown dog. In the ...
CS
Answered by Clara S. • German tutor
2825 Views

How to structure a discursive essay?

A discursive essay, like most essays, should begin with an introduction and end with a conclusion. You can either talk about a topic neutrally, showing both the pros and cons, or you can argue for or against...
LD
30327 Views

Explain the factors which might determine the natural rate of unemployment (15 Marks)

Labour mobility (Frictional) Geographical immobility of labour Certain areas are too expensive to live in thus pricing out workers from jobs in an area, especially if transport links are poor Renders people ...
ID
Answered by Issa D. • Economics tutor
9631 Views