Question

Sin90+sin30= is ?????????????

Answer 1

sin(90+30) is in the form of sin (A+B) sin(A+B)= sinA cosB+CosA sinB sin(90+30)=sin90 cos30 + cos90 sin30 sin90°=1,cos90°=0

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Answer 2

Answer

We use the trigonometric identity here as

Sin(a+b)=sinaCosb+CosaSinb

Sin(90+30)=Sin90Cos30+Cos90Sin30

Sin (90+30)=(1) Cos30 +(0)(1/2) ;As Sin 90=1 and Cos90=0

Sin (90+30)=Cos30

More

Sine and cosine — a.k.a., sin(θ) and cos(θ) — are functions revealing the shape of a right triangle. Looking out from a vertex with angle θ, sin(θ) is the ratio of the opposite side to the hypotenuse , while cos(θ) is the ratio of the adjacent side to the hypotenuse .