Math, asked by awantika5755, 9 months ago

Cos(a+b)=135 , cosa×cosb+sina×sinb

Answers

Answered by koala28

0

Answer:

cosa+b=90

Step-by-step explanation:

then a=45

b=90

then 45+90=135

cosa×cosb=0

+sin45×sin90=1/root2

0+1/root2=1/root2 or sin45 is the ans

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