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Natali [406]
3 years ago
5

Tan^2 70° -sec^2 70°​

Mathematics
1 answer:
kipiarov [429]3 years ago
4 0

Answer:

-1

Step-by-step 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.

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Step-by-step explanation:

Given that:

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Which is the value of this expression when a=5 and k=-2
Zinaida [17]

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