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Evaluate sin 105°+cos 105°

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Evaluate sin 105°+cos 105°

Posted by Ayush Pathak 5 years, 7 months ago

CBSE > Class 11 > Mathematics

2 answers

Naved Khan 5 years, 7 months ago

Sin 150=sin(45+60) Sin (a+b)=sin a cos b+cos a sin b =sin45×cos60+cos45×sin60 =(1/root2×1/2)+(1/root2×root3/2) =1/2root2+root3/2root2 =1+root3/2root2

2Thank You

Xyz Abc 5 years, 7 months ago

Write 105° as (45+60)° and then use the formula sin(a+b) and cos(a+b)

0Thank You

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CBSE > Class 11 > Mathematics