if tanA=sec2A then find sin2A
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tanA=sec2A
sinA/cosA=sec2A
sinA/cosA*1/sec2A=0
sinA/cosA*cos2A=0
sin2A=0
sinA/cosA=sec2A
sinA/cosA*1/sec2A=0
sinA/cosA*cos2A=0
sin2A=0
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