Ответ:
1.
cos² a+ sin²a=1
25/289+sin² a =1
sin a = √264 /17=2√66/17
tg a= sin a/cos a=2√66/5
ctg a=5/2√66 = 5√66/132
2.
LA-60°, LC-60°, LB-120°, LD-120°.
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Answers & Comments
Ответ:
1.
cos² a+ sin²a=1
25/289+sin² a =1
sin a = √264 /17=2√66/17
tg a= sin a/cos a=2√66/5
ctg a=5/2√66 = 5√66/132
2.
LA-60°, LC-60°, LB-120°, LD-120°.