What's 105 degrees Another problem is that The sum of n terms of an arithmetic sequence, if S3 / S6 = 1 / 3 So S6 / S12 = what There is also the question of sin (105 / 2) = what

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• 1. What is 15 What is 15 degrees
• 2. Given that cos β = 2 / 3, the terminal edge of angle a - β is on the nonnegative half axis of y-axis, the value of COS (2a-3 β) can be obtained
• 3. Let α < β < Π / 2, sin α = 3 / 5, cos (α - β) = 12 / 13, then the value of sin β is () a.16/65 b.33/65 c.56/65 d.63/65
• 4. Cos ^ 2A * Tan ^ 2A = sin ^ 2A? Why
• 5. A point P (- 4,3) cos (π / 2 + α) sin (- π - α) / cos (11 π / 2 - α) sin (9 π / 2 + α) on the terminal edge of known angle α
• 6. Given sin2a = a, cos2a = B, find Tan (π / 4 + a) RT
• 7. It is known that α is an acute angle, satisfying Sin & sup2; α + cos & sup2; α = 1, sin α = (90 & ordm; - α) (1) Find the value of Sin & sup2; 36 & ordm; + Sin & sup2; 54 & ordm (2) Find the value of Sin & sup2; 1 & ordm; + Sin & sup2; 2 & ordm; + Sin & sup2; 3 & ordm; + ··· + Sin & sup2; 88 & ordm; + Sin & sup2; 89 & ordm
• 8. Given that X1 and X2 are the two real roots of the equation x ^ 2-2x-2 = 0, we can solve the equation to find the value of x2 + (2 △ x1)
• 9. Given that X1 = - 2 is a root of the equation x2 + mx-6 = 0, find the value of M and the other root of the equation x2
• 10. When m is the value, the univariate quadratic equation x ^ 2 + (2m-3) x + (m ^ 2-3) = 0 Why the value of M has two real roots
• 11. What does the square of sin mean?
• 12. How can 4 0.5 be equal to 6?
• 13. How much is 18 meters long, 0.5 meters wide and 1.2 meters high
• 14. 1:2 equals 0.8. What's the ratio?
• 15. How can five 5S be equal to zero?
• 16. If the terminal edge of an angle passes through point P (1, √ 3), what is the tan value of the angle
• 17. In the plane rectangular coordinate system, it is known that the two ends of the line AB are a (- 4, - 1), B (1,1), respectively. After translating the line AB, we get the line a ′ B ′ If the coordinate of a 'is (- 2,2), then the coordinate of B' is ()
• 18. Example 4. As shown in the figure, in the plane rectangular coordinate system, there is a line segment AB, where a (6,9 / 2), B (6,0). (1) take the origin o as the quasi center, enlarge AB to 2 times, And the corresponding line CD is on the left side of the y-axis (2) Under the condition of (1), translate the position like center upward along the y-axis, and record it as P, so that the corresponding point D of a after translation is on the x-axis, then what is the length of OP? (3) What do you find in the calculation of 1 / AB + 1 / CD and 1 / op in question (2)? If the magnification of a and B coordinates are changed, is the conclusion still valid?
• 19. If sin a / sin B = C, then a / b =? RT
• 20. If sin (α + β) / sin (α - β) = A / B, then Tan α / Tan β = () Please give me the solution