Question

If x = a sec A.cos B
y=b sec A sin B and
z= c tan A
prove that :

x²/a² + y²/b²-z²/c²​

Answer 1

Answer:

sinS+sin(S-A)+sin(S-B)-sin(S-C)

{sinS-sin(S-C)}+{sin(S-A)+sin(S-B)}

2cos(2S-C)/2sin(C/2)+2sin(C/2)cos(B-A)/2

=2sinC/2[cos(A+B)/2 +cos(B-A)/2]

=2sinC/2 .[2cos(B/2)cos(A/2)]

=4cos(A/2)cos(B/2)sin(C/2)

THANKS  AKA@@@rorororororhrithtit

0

Step-by-step explanation: