campridge trigonometry

posted by .

prove that ; tan20 . tan30 . tan40 = tan10

Similar Questions

1. trigonometry

tan60=2 tan30/1-tan^2 30 sqrt(3)=I'm confused of that 2 but i guess it means to multiply. again.. sqrt(3)= (2) sqrt(3)/3 / 1- sqrt(3)/2 ^2 now i don't know how to square tan . if u can show me in details i would appreciate it. this …
2. trig

prove that :tan20 tan30 tan40 =tan10
3. Pre-Calculus

I need help on these problems they are from my study guide and i don't have a clue on how to do these 3 problems and if anyone can show the steps and somewhat explain the steps so i can do it myself next time. 1.) sin25‹cos35‹sin‹35 …
4. TRIGONOMETRY

hey can somebody help me , its like a hundred questions, im helping my cousin doing it...lol cos=sin60 sin=cos45 tan=1/tan30 cos^2(90' -0)/1-cos - sin(90' - O)
5. precalculus

Write each expression as sine, cosine, or tangent of an angle. Then find the exact value of the expression tan 50-tan20/1+ tan 50 tan20
6. Math

prove: tan10+tan70+tan100=tan10.tan70.tan100
7. math urgent

Prove : Tan20+4Tan20=√3
8. Trigonometry prove need help

Prove that (1-sinb)/(1+sin2b)=tan^2(45-b) plz the b means beta?
9. Opt math

Prove :Tan20+4sin20=square root 3
10. MATHS 2

If x+y=45°, prove that {(cotx+1)(coty+1)}/{cotx×coty}=2 Please help me in this TRIGONOMETRY problem. From the topic - TRIGONOMETRY Ratios of compound angles

More Similar Questions