Question

PQP ( Porove that sing 85 - sings 35 - cos 65° = 0 ​

Answer 1

Answer:

https://www.toppr.com/ask/question/sin85circsin35circcos65circ/

Step-by-step explanation:

Solution

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Correct option is

A

0

sin85  

∘

−sin35  

∘

−cos65  

∘

 

=2(cos(  

2

85+35

​

)sin(  

2

85−35

​

))−cos65

2cos60  

∘

sin25  

∘

−cos65  

∘

 

=2(  

2

1

​

sin25  

∘

)−cos65  

∘

 

=sin25  

∘

−cos(90−25)

=sin25  

∘

−sin25  

∘

 

=0