Question

if triangle ABC is equal to 90 then sin a + b
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Answer 1

Answer:

Step-by-step explanation:

In any triangle sum of all angles of triangle is 180°

Hence ∠a + ∠b + ∠c  = 180°

∠c = 90°   given

=> ∠a + ∠b + 90° = 180°

=> ∠a + ∠b = 90°

sin(a+b) ​   = Sin (90°)  

=> sin(a+b) ​  = 1

Answer 2

Answer:

Correct option is 0

Let y=sinA.sinB

Now given ∠C=90 degree

=>A+B=90 degree

⇒y=sinA.sin(90 degree −A)=sinA.cosA= 1/2sin 2A

Hence maximum value of y is 1/2

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