Question

without using trigonometric tables find sin 15 degree cos 15 degree​

Answer 1

we know that sin(30°)= 1/2

sin(45°) = 1/√2

cos30 = √3/2

cos45= 1/√2

sin (45 °- 30°) =

sin45cos30-cos45sin30.

1/√2×√3/2-1/√2×1/2.

√3-1/2√2.

SIMILARLY FIND THE VALUE OF COS 15 .

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Answer 2

Sin x = cos (90-x)

Sin 15 = cos (90-15)

=cos 75

Cos x = sin (90-x)

Cos 15 = sin (90-15)

= sin 75