© examsiri.com
Question : 72 of 100
Marks:
+1,
-0
Solution:
=(.)−(.) =1.2‌cos‌θ‌− ⇒=2‌cos‌θ‌− ||2=(2‌cos‌θ)2+22−2.2‌cos‌θ‌. ⇒2=4cos2θ+4−4‌cos‌θ.2‌cos‌θ ⇒−2=−4cos2θ ⇒cos2θ= ⇒sec2θ=2 ⇒tan2θ=1 ⇒θ= 1+tan‌θ=2.
© examsiri.com
Go to Question: