Math, asked by katikabasha9985, 8 months ago

evaluate
cos12°- sin78°

Answers

Answered by prajguna

4

Answer:

0

Step-by-step explanation:

sin(90°-Ф) = cosФ

sin(90°-12°) = sin(78°)

sin(78°) - sin(78°) = 0

Answered by dakshdua0342

4

Answer:

0

Step-by-step explanation:

We know

cos(90°-a°) = sina°

so,

cos12° = cos(90°-78°)

= sin78°

Now substituting cos12° = sin78° in

=> cos12°-sin78°

=> sin78°-sin78°

=> 0

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