Question

Tan^2 70° -sec^2 70°​

Answer 1

-1

Explanation:

We need to find the value of tan² 70° -sec² 70°​.

We know that,

`\sec^2\theta-\tan^2\theta=1` ...(1)

We can write the given expression as :

tan² 70° -sec² 70° = -(-tan² 70° +sec² 70°)

=-(sec² 70°-tan² 70°)

Using identity (1)

=-(1)

= -1

Hence, the value of the given expression is -1.