Question

Value of sin15º.cos 15° is:

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Answer 1

Answer:

1/4  Ans.

Step-by-step explanation:

2SinACosA = Sin2A.

SinACosA = Sin2A/2

A = 15°  and 2A = 30°.

Sin15°Cos15° = Sin 30° / 2 =  1/2/2  = 1/4.

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Answer 2

Answer:sin15 cos 15

Sin (45-30)& cos (45-30)

1st sin (45-30) = sin 45 cos 30-cos 45 sin 30

After putting this value then find sin (45-30)

2nd cos (45-30) = Cos 45 cos30+ sin 45 sin 30

After putting this value then find cos (45-30)

Then after cos 15 . Sin 15

Then the answer is 1/4

Step-by-step explanation: