what is the value of cos70 sec20
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hey here is your answer
Substituting 70∘ for a and 20∘ for b. we have cos(90∘)=cos(70∘)⋅cos( 20∘)−sin(70∘)⋅sin(20∘)
hope this helps you dear ☺️☺️☺️☺️
Substituting 70∘ for a and 20∘ for b. we have cos(90∘)=cos(70∘)⋅cos( 20∘)−sin(70∘)⋅sin(20∘)
hope this helps you dear ☺️☺️☺️☺️
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