Help me solve this question.
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Things to know:
1) Let α =a and β = b .
sin a = 2tan (a/2)/(1+tan^2(a/2) )
cos a = [1- tan^2(a/2)] / [1+tan^2(a/2)]
2) cos (a + b ) = cos a cos b - sin a sin b
Steps :
1) First find roots of the quadratic equation .
(shown in pic 1)
2) There are two cases available for two roots .
Case 1: When tan (a/2) = 5/2 and tan( b/2) = 3/4 .(shown in pic 1)
Case 2: When tan (a/2) = 3/4 and tan (b/2) = 5/2
( This will also give same answer )
Final result :
cos (a + b) = -627/725
Hope , you understand my answer and it may help you!
1) Let α =a and β = b .
sin a = 2tan (a/2)/(1+tan^2(a/2) )
cos a = [1- tan^2(a/2)] / [1+tan^2(a/2)]
2) cos (a + b ) = cos a cos b - sin a sin b
Steps :
1) First find roots of the quadratic equation .
(shown in pic 1)
2) There are two cases available for two roots .
Case 1: When tan (a/2) = 5/2 and tan( b/2) = 3/4 .(shown in pic 1)
Case 2: When tan (a/2) = 3/4 and tan (b/2) = 5/2
( This will also give same answer )
Final result :
cos (a + b) = -627/725
Hope , you understand my answer and it may help you!
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sayeem786:
this doesn't have the option mark as brainliest.
Only when Two answers are given
if someone answers it I'll surely mark this as brainliest.
ok thanks!
I'm asking one more.
Ok but in question section!
yeah
sure
quick as I have to go now!
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