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CBSE Class 10 Answered

prove that
Asked by haynes | 08 Apr, 2009, 07:52: PM
answered-by-expert Expert Answer

L.H.S.=sin2A + cosec2A + 2sinA cosecA + cos2A + sec2A + 2cosA cosecA

now use sin2A + cos2A=1 and cosec2A=1+cot2A and sec2A=1+tan2A

we get

=1+2+2+(1+cot2A ) + ( 1+tan2A)

=7+tan2A+cot2A

Answered by | 09 Apr, 2009, 01:28: AM

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