Tan α = 2 for (2Sin α - cos α) * (sin α - cos α)

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• 1. sin^4+sin^2cos^2+cos^2a=
• 2. It is known that Tan (α + β) = 2tan β, and proved that 3sin α = sin (α + 2 β)
• 3. It is known that Tan α - Tan β = 2tan α ^ 2tan β, and α β is not equal to K π / 2. Try to find sin β sin (2 α + β) / sin β Or it can give you ideas This is known: Tan α - Tan β = 2tan α Tan α Tan β
• 4. If cos α + 2Sin α = - 5, then Tan α=______ ．
• 5. Tan α = 12, sin α − 3cos α sin α + cos α=______ ．
• 6. Given TGX = - 2, find (Sin & sup2; X + 3cos & sup2; x) / (3sin & sup2; x-cos & sup2; x)
• 7. How to calculate Tan α = 2,2 / 3sin & sup2; α + 1 / 4cos & sup2; α
• 8. Y = (4-3sin x) (4-3cos x) minimum
• 9. The parametric equations are transformed into ordinary equations, and the curves x = 5cos, y = 3sin, are explained
• 10. It is known that the coordinates of three points a, B and C are a (3,0), B (0,3), C (COS α, sin α), (α ≠ K π 4, K ∈ z), respectively. If AC · BC = - 1, then the value of 1 + sin2 α − Cos2 α 1 + Tan α is 1______ ．
• 11. The three interior angles of △ ABC satisfy the equation (SINB Sina) x2 + (Sina sinc) x + (sinc SINB) = 0, and have two equal real roots, then: 1. Prove: ∠ B ≤ π / 3 2. If ∠ B takes the maximum value, try to judge the shape of △ ABC
• 12. In △ ABC, C = B (1 + 2cosa), the proof angle a = 2 angle B Step by step, thank you
• 13. If 2 is the square of the quadratic equation of one variable x = x plus a root of C, then what is the constant C?
• 14. Can the constant term of quadratic equation of one variable be 0 Can the coefficient of quadratic term of quadratic equation with one variable be 0?
• 15. Using image method to find the approximate solution of the quadratic equation of one variable - X & sup2; + 2x-3 = - 8 (accurate to 0.1)
• 16. Given the equation x ^ 2 + 3x-2 = 0, find a new quadratic equation with one variable so that its roots are twice the roots of the original equation, then the new equation is______ Given that the two roots of the equation x ^ 2 + (m-2) x + (n + 3) = 0 are - 2, - 3, then M + n=________
• 17. The two roots of the quadratic equation x ^ 2-3x + 1 = 0 are X1 and X2 respectively. Then the value of X is a.3b. - 3c.1/3 D. - 1 / 3
• 18. 4X square - 8x + 1 = 0, solve the quadratic equation of one variable
• 19. Equation: the square of 4x - 8x + 1 = 0 is solved by formula method
• 20. The square of a number is 2.89? The sum of all negative integers whose absolute value is greater than 3.6 but less than 6.3 is? 1 / 4 divided by (- 2 and 2 / 1) + (11 and 1 / 4 + 2 and 1 / 3-13 and 4 / 3) multiplied by 24 =? | A-1 | + | B + 2 | = 0 2A + B. there will be more questions about + 100