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49. यदि 7 sin-03 cos20 = 4, तव tan 0 का मान ज्ञात कीजिए। |
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Answer» 7sina^2+3 cosa^2=7( 1-cosa^2)+3 cosa=7-7 cosa^2+3 cosa= 4cosa=7-4cosa^2; cosa^2=3/4; seca=1/ cosa=4/3, 1+ tana^2=4/3; tana^2=4/3-1=4-3/4=-1/3; tana=-1/V3 |
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