evaluate:
sin25*cos65*+cos25*sin65*
sin25 * cos65 + cos25 * sin65
= sin(90-65) * cos65 + cos(90-65) * sin65
= cos65 * cos65 + sin65 * sin65
= cos265 + sin265
= 1
evaluate:
sin25*cos65*+cos25*sin65*
sin25 * cos65 + cos25 * sin65
= sin(90-65) * cos65 + cos(90-65) * sin65
= cos65 * cos65 + sin65 * sin65
= cos265 + sin265
= 1