If 3sinx + √ 3 cos x = 2 √ 3 sin (x + y), (- Pie)
3sinx+√3 cos x=2√3(√3/2 sin x+1/2cosx)=2√3 sin(x+π/6)=2√3 sin(x+y)
Y = π / 6 + 2K π, K belongs to integer, and because y belongs to (- π, π)
So y = π / 6
RELATED INFORMATIONS
- 1. Sin (π / 3 + α) = 1 / 3, then cos (π / 6 - α)=
- 2. F (x) is continuous on [0, π] and differentiable in (0, π). It is proved that there is at least one point of ε in (0, π) such that f '(ε) sin ε + F (ε) cos ε = 0
- 3. Let α∈ (0, π / 4), sin α + cos α = 7 / 5, then Tan α=___
- 4. If a = Tan (- 7 π / 6), B = cos23 π / 4, C = sin (- 33 π / 4), the comparison is large
- 5. 1. Given sin α = (2 √ 5) / 5, find Tan (α + π) + [sin (5 / 2 π + α) / cos (5 / 2 π - α)] 1. Given sin α = (2 √ 5) / 5, find Tan (α + π) + [sin (5 / 2 π + α) / cos (5 / 2 π - α)] 2. (1) if angle α is the second quadrant angle, simplify Tan √ [(1 / sin ^ a) - 1] (2) Simplification: [√ (1-2sin130 ° cos130 °)] / [sin130 ° + √ 1-sin ^ 2 (130 °)]
- 6. Given Tan θ / 2 = 1 / 4, find sin θ + cos θ,
- 7. Evaluation: (1) sin (4 π / 3) cos (7 π / 6) Tan (21 π / 4) (2) sin (23 π / 6) cos (- 17 π / 4) Tan (π / 8) Tan (3 π / 8) requires detailed process
- 8. Given sin + cos divided by sin cos = 2, the value of sin COS is Given sin + cos divided by sin cos = 2, the value of sin times COS is
- 9. cosα·tanα-Sinα
- 10. ∫ (1 / (SiNx + cosx)) DX, the integral interval is 0 to Pai / 2, it is better to use the universal formula and sin (x + Pai / 4) two methods
- 11. What condition is sin α = 1 / 2 for Cos2 α = 1 / 2 Is it unnecessary? How to push?
- 12. Simplification: sin (2 α + β) / sin α - 2cos (α + β) RT.
- 13. If sin (π - a) - cos (π + a) = 2 / 3 and a is the second quadrant angle, then sin (2 / π + a) + cosa (2 / π + a)=
- 14. It is known that sin α = 13 and α is the angle of the second quadrant. (1) find the value of sin (α − π 6); (2) find the value of COS 2 α
- 15. cos2(-a)-tan(360+a)/sin(-a)
- 16. If 0 ≤ α < 2 π, if sin α < 0 and Cos2 α < 0, what is the value range of α
- 17. Known Tan & # 178; a = 2tan & # 178; B + 1 to find cos2a + Sin & # 178; b = how much? Which prawn to solve me, thank you very much
- 18. If Tana = 3, then sinacosa + (COSA) ^ 2= Like the title,
- 19. Tana is equal to 0.116, what degree is a equal to? Specific degree
- 20. Given Sina + cosa = 1 / 3, find the value of TA ③ Na + cot ③ a ③ It's cubic