29 question 1 part plz help
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vijayjain41:
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Class 10
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Prove:
sinA - 2sin^3 A /2cos^3A - cosA=tanA
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L .H. S
=>sinA - 2sin^3A/ 2cos^3A - cosA
=>sinA( 1 - 2sin^2A )/ (2cos^2A - 1)cosA
since, we know that ,
Note: cos2A =1 - 2sin^2A = 2cos^2A - 1,
=>sinA × cos2A/ cos2A × cosA
=>sinA / cosA
=>tanA = R.H.S
hence, proved .
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|| hope helps ||
_______________________________
Prove:
sinA - 2sin^3 A /2cos^3A - cosA=tanA
_______________________________
L .H. S
=>sinA - 2sin^3A/ 2cos^3A - cosA
=>sinA( 1 - 2sin^2A )/ (2cos^2A - 1)cosA
since, we know that ,
Note: cos2A =1 - 2sin^2A = 2cos^2A - 1,
=>sinA × cos2A/ cos2A × cosA
=>sinA / cosA
=>tanA = R.H.S
hence, proved .
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|| hope helps ||
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