9th std 8. lesson trigonometry questions & answer
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question 1,2 and 4 fig is missing
so, in question 3
L LMN=90°
L L= 50°
L N= 40°
sin 50°= p/h = NM/LN
cos 50°= b/h= LM/LN
tan 40°= p/b= LM/NM
cos40°= b/h= NM/LN
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