Trigonometric functions - class-XI
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Multiple Choice
If $\tan 4x+\tan 5x-\tan 9x=k\tan 4x\tan 5x\tan 9x$ then $k=$
- $1$
- $-1$
- $ \pm 1$
- $2$
Casual Mode - Take your time!
If $\tan 4x+\tan 5x-\tan 9x=k\tan 4x\tan 5x\tan 9x$ then $k=$