Given cot = 1 / 2, find the value of sina times cosa

It's two fifths

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1. Sinacosa = 1 / 8, and Wu / 4
2. Given Tana = 2 / 3, find Sina times cosa, and then divide by sin's square a minus cos's Square a
3. Sina and cosa are two of the equations 13X square-7x + M = 0, (1). Find the value of Tana (2). 1-tana / cos 2A × (1 + Tana)
4. What is 1 + (Tana) ^ 2 How much is the simplification
5. Tana = 1 / 3, how many degrees does a equal
6. Tana = 0.1 A is equal to what degree? Be specific```` Yes + points```
7. If Tana = 1 / 2, what degree is ∠ a equal to
8. Tana = 3 find the square of the following formula (Sina) - 2sinacosa - (COSA) / 4 (COSA) - 3sinacosa
9. If Tana = - 2, then the square of Sina - 3 * (the square of COSA) =?
10. Given that a is an acute angle, and Sina cosa / Sina + cosa = 1 / 3, Tana = Sina / cosa, find Tana
11. Given that a belongs to (Wu / 2,3 Wu / 2), Tan (A-7 Wu) = - 3 / 4, then the value of sina + cosa is equal to?
12. In the triangle ABC, it is known that sina + sinc = 2sinb, and B = 60 degrees. If the area of triangle ABC is [root 3 / 2], then the opposite side B of angle B is equal to
13. (COSA) 2 / (SINB) 2 + (Sina) 2 / (Cos2) = 1 It's not (Cos2), it's (CoSb) &; It's not a + B = 45 degrees, it's a + B = 90 degrees a,b∈（0,90°）
14. If Sina = 5, then cosa + sina is cosa Sina + cosa sina is cosa + Sina=
15. 15(sin2θ + cos2θ) × 37(sin2π + cos2π) = 0
16. Given Tan α + cot α = 52, α ∈ (π 4, π 2), then Cos2 α = 1___ ．
17. Given Tan α + cot α = 52, α ∈ (π 4, π 2), find the values of COS 2 α and sin (2 α + π 4)
18. Sin θ / radical (1-sin & sup2; θ) + radical (1-cos & sup2; θ) / cos θ Theta belongs to (3 π / 2,2 π)
19. Sin θ - cos θ = 1 / 2, then Tan θ + cot θ=
20. Sin Θ - cos Θ = 1 / 2, find Tan Θ + cot Θ