[tan(-330)cos(-570)cos150sin(-420)]/[cos(-420)sin(-690)]
=tan(-360+30)cos(-540-30)cos(180-30)sin(-360-60)/cos(-360-60)sin(-720+30)
=tan30 -cos30 -cos30 -sin60/cos60sin30
=-3/2
[tan(-330)cos(-570)cos150sin(-420)]/[cos(-420)sin(-690)]
=tan(-360+30)cos(-540-30)cos(180-30)sin(-360-60)/cos(-360-60)sin(-720+30)
=tan30 -cos30 -cos30 -sin60/cos60sin30
=-3/2