Question Text
Question 3 :
If $\displaystyle \theta =45$ then $\displaystyle \frac { 2\tan { \theta  }  }{ 1+{ \tan }^{ 2 }\theta  } $ is :
Question 4 :
If $sin({ 90 }^{ 0 }-\theta )=\dfrac { 3 }{ 7 } $, then $cos\theta $
Question 6 :
If $\displaystyle \theta ={ 30 }^{ o }$ then $\displaystyle \cos { 2\theta } $ is :
