Questionnaire 7.10 Use value substitution of s sin o cos' o do 3.

The value of sin35^o +cos65^o -cos5^o is:

Find the value of sin38^o +cos68^o -cos8^o

sin15^o +cos15^o is:

Write the value of |sin20o-cos20osin70ocos70o| .

Find the value of tan 2A if cos 3A = sin 45^o .

Write the value of sin A cos(90o-A)+cos A sin(90o-A)

If cot O/ = 9/12 then find the value of (sin O/ + cos O/)/(sin O/ - cos O/)+(sec O/ + cosec O/)/(sec O/ - cosec O/)

Outline the preparation of the following compounds using a nucleophilic substitution reaction : CH_3CH_2-O - N = O

Prove that sin75^o -sin15^o =cos105^o +cos15^o

Prove that: (cos18o)/(sin10o)+cos59o cos ec31o=2