=
tan
.
sin 30 – sind = cot20
cos - cos 30
sin A - sin B
cos A + cos B
sino + sin 20 + sin30 = tan 20
cos 0 + cos20 + cos 38
(cosa – cosp)2 + (sin a – sinß)2 = 4sin2 @- ß
cos 10° + cos 110° + cos 130º = 0
sin 85° - cos 65º = cos 55°
sin 18° + cos 18° = /2 cos 27°
TGT
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