somi teez
Last Activity: 7 Years ago
for above ...sorry....something wrong went
okay now,
lets consider tan 20 – 2 tan 10=(sin 20*cos 10 -2 sin 10 * cos 20) / cos 10*cos 20
=((sin 30 +sin 10) –2 (sin 30 -sin 10 )) /2 cos 10*cos20
=4 sin ^3 10/(2 cos 10 *cos 20) > 0 (as, domain of sin and cos >1 or
tan 20 > 2 tan 10 …....(1)
so, y>x and z>w
now, 2w -2y
=2 tan 10 +tan 70 – tan 20 – tan 50
=2 tan 10 + tan 50 = 2x which is positive
so, w=x+y and w >y
plz approve it
