Question : Evaluate the following.
$\sin 25° \sin 65° – \cos 25° \cos 65°$
Option 1: 4
Option 2: 1
Option 3: 0
Option 4: 40

Question

Question : Evaluate the following.
$\sin 25° \sin 65° – \cos 25° \cos 65°$

Option 1: 4

Option 2: 1

Option 3: 0

Option 4: 40

Team Careers360 · Accepted Answer

Correct Answer: 0

Solution : $\sin 25° \sin 65° - \cos 25° \cos 65°$
$=\sin 25° \sin(90° - 25°) - \cos 25° \cos(90° - 25°)$
$=\sin 25° \cos 25° - \cos 25° \sin 25°$
$=0$
Hence, the correct answer is 0.

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Question : Evaluate the following. sin⁡25°sin⁡65°–cos⁡25°cos⁡65°Option 1: 4Option 2: 1Option 3: 0Option 4: 40

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Question : Evaluate the following.
$\sin 25 ° \sin 65 ° - \cos 25 ° \cos 65 °$
Option 1: 4
Option 2: 1
Option 3: 0
Option 4: 40