सिद्ध कीजिए की ( sin 420^(@) cos 390^(@)...

सिद्ध कीजिए की ( sin 420^(@) cos 390^(@) +cos ( -300^(@) )sin (-330^(@) ) = 1 | 11 | त्रिकोणमि...

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Prove that: sin420^(@)cos390^(@)+cos(-300^(@))sin(-330^(@))=1

Prove that: sin(-420^(@))cos390^(@)+cos(-660^(@))sin330^(@)=1

Prove that sin(-420^(@))(cos390^(@))+cos(-660^(@))(sin330^(@))=-1

Prove that: sin(-420^(@))(cos390^(@))+cos(-660^(@))(sin330^(@))=-1

The value of sin 600^(@) cos 330^(@)+ cos 120^(@) sin 150^(@) is

What is the value of Sin420^@.cos390^@ + cos(-300^@). sin(-330^@ )?

Prove that: "sin"420^(@) cos390^(@)+cos(-660^(@))"sin"(-390^(@))=(1)/(2) .

sin120^(@)cos150^(@)-cos240^(@)sin330^(@)

sin120^(@)cos150^(@)-cos240^(@)sin330^(@)=

sin150^(@).cos120^(@)+cos330^(@)*sin660^(@)=-1