83.2k views
2 votes
Find the value for a that makes sins=cos25

User Davorak
by
8.4k points

1 Answer

4 votes

Answer:

Ans: 0.766

Explanation:

Use the trig identity: cos (a + b) = cos a,cos b - sin a.sin b

cos (25 + 15) = cos (40) = cos 25.cos 15 - sin 25.sin 15.

The arc

40

doesn't have exact functional value.

You may get its approx. value by calculator.

cos 40 = 0,766

User Dalays
by
7.6k points

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