The value of sin 20o cos 70o + sin 70o cos 20o is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e 1.
| Understanding/Application |
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sin200 cos700 + sin700 cos200 = sin200 cos700 + cos200 sin700 |
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sinA cosB + cosA sinB = sin(A + B) = sin200 cos700 + cos200 sin700 = sin(20 + 70) = sin900 = 1 |