If cosA = sinB = 1/3 and `pi/2``<``A``<``pi` and `pi``<``B``<``3pi/2`, find `(frac(tanA+tanB)(tanA-tanB))`

If sinA/3=sinB/4=1/5 and A,B are angles in the second quadrant,find the value of 4cosA+3cosB

If sinA/3=sinB/4=1/5 and A,B are angles in the second quadrant then prove that 4cosA+3cosB=-5

If sin A = 1/sqrt10 and sin B =1/sqrt5 , where A and B are positive acute angles, then A + B is equal to.................. A) pi B) pi/2 C) pi/3 D) pi/4

Solve the followimg In /_\ABC if cosA = sinB-cosC, then show that it is a right angled triangle.

If sinA=-5/13 , pi < A < (3pi)/2 and cosB=3/5 , (3pi)/2 < B < 2pi find sin(A+B)

If sinA=-5/13 , pi < A < (3pi)/2 and cosB=3/5 , (3pi)/2 < B < 2pi find cos(A-B)

If sinA=-5/13 , pi < A < (3pi)/2 and cosB=3/5 , (3pi)/2 < B < 2pi find tan(A+B)

If sin A=a cos B and cosA=b sinB then, (a^2 - 1) tan^2 A+(1 -b^2)tan^2B is equal to