Question

The value of Sec² 72° - tan²72° is ​

Answer 1

Answer:

The value of sec²72⁰ - tan²72⁰ is 1.

Step-by-step explanation:

We know, from trigonometric identity:

sec²∅ - tan²∅ = 1

Hence, sec²72⁰ - tan²72⁰ is also 1.

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