sin a = _____?
- 1 + tan²a
- 2 sin a cos a
- 2 sin a/2 cos a/2
- None of these
Explanation
Trigonometric Identity
Given: sin a
The double-angle formula for sine is sin 2a = 2 sin a cos a, but there's also a relation involving half-angles: sin a = 2 sin a/2 cos a/2.
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