Question

What is the value of sin20cos80+cos 20 sin 80 without using the trigonometric table?

Answer 1

HERE'S YOUR ANSWER:

SIN20.COS80 + COS20.SIN80 = 1

STEP BY STEP EXPLAINATION:

• BY CONVERTING SIN INTO COS AND VICE VERSA.
• COS(90-20).COS80 + SIN(90-20).SIN80
• COS70.COS80 + SIN70.SIN80
• COS^2 5600 + SIN^2 5600 = 1 (BY USING THE IDENTITY COS^2 + SIN^2 = 1

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