If P (4, y) is a point on the edge of angle A and Sina = - 2 times the root 5 / 5, then y =? 7

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• 1. If we know that the vertex of angle a coincides with the origin, the starting edge coincides with the positive half axis of X axis, and the ending edge is on the line y = 3x, ask cos2a =?
• 2. Given the quadratic function f (x), the vertex of the image is (- 1,2), and through the origin, find f (x)
• 3. Solving the right focus polar coordinate equation of mathematical conic Is it the same
• 4. In the polar coordinate system, we know two points a (6, π / 6) B (6, 2 π / 3) to find the polar coordinates of the midpoint of ab,
• 5. As shown in the figure, in the triangle AOB, the coordinates of a and B are (- 4, - 6), (- 6, - 3), respectively. Calculate the area of the triangle AOB (hint: the area of the triangle AOB can be regarded as the area of a trapezoid minus the area of some small triangles)
• 6. In the triangle AOB, the coordinates of two points AB are (- 4, - 6), (- 6, - 3) respectively, and the area of the triangle can be calculated (hint: the area of the triangle AOB can be seen from
• 7. It is known that the polar coordinates of the two ends of the line segment passing through the pole are P1 (ρ 1, θ 1) P (ρ 2, θ 2 + π), and the midpoint m of p1p2 is proved（ It is known that the polar coordinates of the two ends of the line segment passing through the pole are P1 (ρ 1, θ 1) P (ρ 2, θ 2 + π). It is proved that the midpoint of p1p2 is m (ρ 1 - ρ 2, θ 1)
• 8. The vertex o (0,0), a (2,1), B (10,1) of triangle OBC, the line CD is perpendicular to the X axis and bisects the area of triangle ABC. If D (x, 0), then the value of X is
• 9. The range of y = Sina / (COSA + 2)
• 10. If for any real number a, f (Sina + COSA) = sinacosa, find f (0) + F (1)?
• 11. Given that the image of function y = - x + 4 intersects with y axis at point a, and the image of function y = - 3x-6 intersects with X axis at point B, then ab=____
• 12. If a is an acute angle, then the minimum value of 1 / 2 of sina plus 4 / 2 of cosa is? Dear friends, please be more serious. Four people answered three kinds of answers. It's a test of my IQ~
• 13. Given cosa = - 3 / 5, and a is the second quadrant angle, find Sina and Tana
• 14. If a is the third quadrant angle, Sina + cosa = 5 / 9, sin2a =?
• 15. Let a be the second quadrant angle, Sina = 1 / 2; find the value of sin (a + Wu / 4) / sin2a + cos2a + 1
• 16. It is known that sina = 2 / 3, cosx = - 3 / 4, and a and X are the second quadrant angles. Find sin (A-X), cos (a + x), Tan (a + x)
• 17. Given that the terminal edge of angle a passes through point m (7, - 24), then Sina + cosa = -————
• 18. It is known that sina = 4 / 5 (0
• 19. Given a (- 1, - 5), B (3, - 2), the inclination angle of line L is twice that of line AB, and the slope of line L is calculated
• 20. It is known that the line L passes through points a (2,3), B (2m, - 1). When the inclination angle a of the line L is an acute angle, the It is known that the line L passes through points a (2,3), B (2m, - 1). When the inclination angle a of the line L is an acute angle, the value range of M is?