Answer:
see explanation
Step-by-step explanation:
Using the trigonometric identities
1 + tan²A = sec²A , secA =
, cosecA =
, cotA =
, tanA = 
Consider the left side

= 
= 
= 
=
× sin²A
= 
= tanA = right side , thus proven
Answer:
90 cm²
Step-by-step explanation:
since the ratio is 1:6 for every one little box the bigger box increases 6 times.
so 15·6= 90 cm²
Answer:
139 degrees
Step-by-step explanation:
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