Question

Without using trigonometric tables, evaluate: sin 25° cos 65°+cos 25° sin 65


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Answer 1

Answer:

1

Step-by-step explanation:

sin25°cos65°+cos25°sin 65°

By formula, we know

sin (x+y)=sin x cos y+cos x sin y

So it's of this form

sin

sin (25+65)°

sin 90°

which is equal to 1