Question

Find the Value of Tan²∅-1/cos²∅

Answer 1

Answer:

-1

Step-by-step explanation:

Here we use the trigonometric identity 1+ tan²∅ = sec²∅

Given expression,

tan²∅ - (1/cos²∅)

= tan²∅ -  sec² ∅

= tan²∅ - (1 + tan²∅)

= tan²∅ -1 - tan²∅

= -1

Hope it helped