TS EAMCET · Maths · Trigonometric Ratios & Identities
If then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
Given, sinx+ysinx-y=a+ba-b sinx.cosy+cosx.sinysinx.cosy-cosx.siny=a+ba-b Use, componendo & dividendo sinx.cosy+cosx.siny+sinx.cosy-cosx.sinysinx.cosy+cosx.siny-sinx.cosy+cosx.siny=a+b+a-ba+b-a+b 2sinx.cosy2cosx.siny=2a2b sinxcosxsinycosy=ab tanxtany=ab
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