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

Find sin2x,cos2x,tan2x if secx=-13/5 , pi/2 < x < pi

Select and write the correct answer from the given alternatives in each of the following : If sinA=1/sqrt10,sinB=1/sqrt5 then A+B =……….

If sintheta=12/13 0<(theta)<(pi/2)) and cosphi=-3/5 (pi<(phi)<(3pi)/2) then sin(theta + phi ) will be

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

If sintheta=(12)/(13),(0ltthetalt(pi)/(2))and cosphi=-(3)/(5),(piltphilt(3pi)/(2)) . Then , sin(theta+phi) will be................ A) (-56)/(61) B) (-56)/(65) C) (1)/(65) D) -56

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

If costheta=12/13 , 0 < theta < pi /2 , find the value of frac(1)(tan^2theta)

If 4sinA=4sinB=3sinC" in a "DeltaABC , then cos C =