It is known that cos (π / 3 + α) = - 3 / 5, sin (2 π / 3 - β) = 5 / 13, and 0

RELATED INFORMATIONS

• 1. Given Tan (a + π|4) = 3 + 2 radical 2, find 1-cos2a|sin2a
• 2. Sin2a = 4 / 5 A contains 2 / 4 π and 3 / 4 π to find cos2a sin4a cos4a tan4a
• 3. 1 + Tana / 1-tana = 5 + 2 times the root sign 6, find the value of 1-sin2a / cos2a (1 + Tana) / (1-tana) = 5 + 2 times root sign 6, find the value of (1-sin2a) / cos2a
• 4. (1 + Tana) / (1-tana) = (radical 3) + 1, find the value of sin2a
• 5. sin^4π/8-cos^4π/8=?
• 6. cos(3π/8)*sin(5π/8)=?
• 7. Calculate the value of 4tan & # 178; π / 4-cos & # 178; π / 3-1 / 2Sin & # 178; π / 6 + sin π / 2 * cos0
• 8. Cos (B / 2) sin (B / 2) = 1 / 4
• 9. Sin (a plus 15 degrees) is one third of a page. What is cos (a plus 105 degrees)
• 10. Cos quarter plus sin six Detailed process! You can clap your hands to write the process
• 11. If α belongs to (0,2 parts of π), β belongs to (2 parts of π, π), sin (α + β) = 65 parts of 33, cos β + negative 13 parts of 5, then what is sin α equal to
• 12. Y = 4sin (Wx + quarter) cos (Wx - quarter) - 2Sin (Wx - quarter) cos (Wx + quarter) (W > 0) for simplification
• 13. It is known that n is a positive integer, PN (xn, yn) is an inverse scaling function y = KX, where X1 = 1, X2 = 2 , xn = n, T 1 = x 1y 2, T 2 = x 2Y 3 If T1 = 1, then T1 ·t2 · The value of T9 is______ ．
• 14. In order to know that the average of sample x1, X2, X3,..., xn is x, and the variance is the square of S, we prove that sample kx1 + 3, kx2+
• 15. It is known that n is a positive integer, PN (xn, yn) is an inverse scaling function y = KX, where X1 = 1, X2 = 2 , xn = n, T 1 = x 1y 2, T 2 = x 2Y 3 If T1 = 1, then T1 ·t2 · The value of T9 is______ ．
• 16. It is known that SN is the sum of the first n terms of the arithmetic sequence {an}, S10 > 0, and S11 = 0. If Sn ≤ SK is constant for n ∈ n +, then the set of positive integers K is______ ．
• 17. It is known that a, B, X1 and X2 are mutually unequal positive numbers, Y1 = (ax1 + bx2) / (a + b), Y2 (BX1 + AX2) / (a + b), try to analyze the size of y1y2 and x1x2, and say
• 18. In the sequence {an}, if A1 = 2 / 3, then a (n + 1) = 1 / (n + 1) (n + 2) is equal to a(n+1)=1/(n+1)(n+2)+an
• 19. Given the sequence {an}, where a1 = 10, and when n ≥ 2, an = 5an-1 / 6an-1 + 5, find the general term formula of the sequence {an} Given the sequence {an}, where a1 = 10, and when n ≥ 2, an = (5an-1) / (6an-1) + 5, find the common term of the sequence {an}
• 20. Let Sn be the sum of the first n terms of the sequence an, Sn = kn * 2 + N, n ∈ n *, where k is a constant, then find A1, an