Posted by **pleasehelp!** on Friday, March 4, 2011 at 12:54am.

1. solve tan36 degrees- tan2degrees/ 1+tan36 degrees tan 2 degrees as a single function.

2. Find the exact value of sin (α-β) if sina=4/5 and cos β= -9/41 terminal side of α lies in I and terminal side of β lies in III

3. If cosx=1/12 and sinx > 0, find tan2x

thankyou!

- PRE CALC -
**agrin04**, Friday, March 4, 2011 at 2:11am
1. tan(36 - 2) = tan 34

2. sin ? = 4/5 --> cos ? = 3/5

cos ? = -9/41 --> sin ? = -40/41

sin(?-?) = sin?*cos? - cos?*sin? = ?

3. tan x = sqrt(143)

tan 2x = 2tanx/(1 - tan^2(x)) = ?

- PRE CALC -
**abhay**, Friday, March 4, 2016 at 5:56am
how to calculate the value of tan36°

## Answer This Question

## Related Questions

- Math - If α and β are two angles in Quadrant II such that tan α...
- physics (speed of plane by radar) - The radar stations A and B, separated by the...
- trigonometry - In questions 2A, 2B, and 2C below, find the exact values using ...
- Pure Mathematics - 4) The roots of the equation z^2+2z+4=0 are denoted by α...
- Trigonometry - The quadratic equation x^2−9x+10=0 has roots tanα and ...
- PHYSICS - This is the same question as last time. "A plane is flying 25 degrees ...
- math - Complex numbers α and β satisfy αα¯=ββ¯=&#...
- Trig - prove sin(α+β)sin(α-β)=cos^2β-cos^2α please...
- chemistry - (a) The phase diagram of the binary system, neodymium-scandium (Nd-...
- mechanics (calculating plane speed and climb angle - Two radar stations A and B...

More Related Questions