The scores (out of 100) obtained by 33 students in a mathematics test are as follows:69,48,84,58,48,73,83,48,66,58,84,66,64,71,64,66,69,66,83,66,69,7181,71,73,69,66,66,64,58,64,69,69
Represent this data in the form of a frequency distribution.
Number of students
Frequency
Prove that: tan69∘+tan66∘1−tan69∘tan66∘=−1