cotA-tanA=2cot2A. prove it
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Answered by
9
Step-by-step explanation:
L.H.S.= cotA-tanA
=cosA/sinA-sinA/cosA
=cos^2A/sinA-sin^2A/cosA
= cos2A/sinA•cosA
=Multiple by 2
=2cos/2sinA•2A•cosA
= 2cos/sin•2A•2A
=2cot•2A
Answered by
1
Answer:
LHS cotA-1/cotA
=cot^2a-1/cotA
now multiply and divide by 2
2(cot^a-1/2cotA)=2cot2A
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