Trigonometry Answers

tan(180/24)tan(3*180/24)tan(5*180/24)tan(7*180/24)tan(9*180/24)tan(11*180/24)tan(16*180/24)

expert sir what is the fundamental theorem of trignometry?
yours Sincerely Akhtar Rasul

If triangle ABC has an area of 3.75cm and a = 5cm and c = 3cm, find the length of b if angle B is obtuse?

If cosA 4/5 and cosB 12/13 (A and B are both acute) Find the values of (i) sin (A+B). (ii) cos (A -B).(iii) tan (A+B). Q2. Write an angle in the first quadrant whose tangent is (a)0.8816 (b)1.9496 (c)2.0265.

(cot^2 betta)/(csc betta)=csc betta-sin betta

cos betta+ sin betta tan betta= sec betta

properties of triangles.

in the following problem,
In a triangle ABC,if r1 is the exradius of the excircle opposite to A,r2 is the exradius of the excircle opposite to B and r3is the exradius of the excircle opposite to C....
prove that (ar1+br2+cr3)/abc=(1/r)-(1/2R)
where r is the inradius and R is the circum radius.
i tried using these formulae:
r1=(area of triangle)/(s-a)
r1=stanA/2
but i cudnt solve it.how should i start?

Determine the domain and the range of the relation
{(2,0),(30,-5),(34,0),(2,3),(54,3)}

sin(x)^2=2cos(x)+2