If cos (a + b) · cos (a-b) = 1 / 3, then the value of COS ^ 2 a-SiN ^ 2 B is?

RELATED INFORMATIONS

• 1. It is known that cos (4 / π + φ) = 4 / 5 and 3 π / 2
• 2. If (sin α + cos α) / (sin α - cos α) = 2, find the value of sin (α - 5 π) sin (3 π / 2 - α)
• 3. Sin α + cos β = 1 / 5, cos α + sin β = 1 / 3, find sin (α + β)= Sin α + cos β = 1 / 5, cos α + sin β = 1 / 3, find sin (α + β)=
• 4. If sin (π 3-A) = 14, then cos (π 3 + 2a) is equal to______ ．
• 5. It is known that cos (a-b / 2) = - 1 / 9, sin (a-2-b) = 2 / 3, and 0
• 6. If cos (α - Π / 6) + sin α = (4 / 5) √ 3 is known, then what is the value of sin (α + 7 Π / 6)?
• 7. Simplifying sin (- 11 π / 3) + cos (12 π / 5) tan2 π - sec13 π / 5cot (- 5 π / 2)
• 8. If sin (π 2 + θ) = 35, then cos (π - 2 θ) equals () A. 1225B. −1225C. −725D. 725
• 9. Verification: 1 / Sin & sup2; a + 1 / cos & sup2; A-1 / Tan & sup2; a = 2 + Tan & sup2; a
• 10. Given sin β + sin2 β = a, cos β + Cos2 β = B, prove (A & sup2; + B & sup2;) (A & sup2; + B & sup2; - 3) = 2B
• 11. If sin α + cos α = 13, then sin 2 (π 4 - α) = () A. 118B. 1718C. 89D. 29
• 12. It is known that sin α - sin β = 1 / 4, cos α + cos β = 1 / 3 I got the answer - 163 / 288, but the teacher gave me a little red fork
• 13. If cos (π / 6 - α) is known, then cos (5 π / 6 + α) × sin (2 π / 3 - α) =
• 14. Given cos (a - π / 6) + sin α = 4 √ 3 / 5, then the value of sin (α - 7 π / 6) is My answers are - (4 + 3 √ 3) / 10 and - (4-3 √ 3) / 10, but not in the options Ask for detailed explanation
• 15. 2 / 3 π is known
• 16. Let sin θ + cos θ = √ 2 / 3, π / 2 Sin θ ^ 3 is the third power of sin θ
• 17. The limit of LIM (1-x ^ 2) / sin Wu x when x approaches 1 Why not multiply a bounded function by infinitesimal and then equal 0
• 18. Find [ln (1 + x)] / X when x approaches the limit of 0,
• 19. Find the limit when (1 / ln (x + 1) - 1 / x) x approaches 0
• 20. When x approaches infinity, the limit is {sin (x) ^ 2-x} \ {(cosx) ^ 2-x} How much is the limit when x approaches integral infinity