Question

Show that Sin 20° cos 70° + cos 20° sin 70° = 1

Answer 1

Answer:

here,

.....sin 20° ×cos ( 90°– 20°) + cos 20° × sin ( 90°–20°)......

= sin 20°×sin 20° + cos 20°× cos 20°

= sin²20° + cos² 20°

= 1

.......thanks my 20 answers.....

.....Royal.... Rajputs.......

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Answer 2

Answer:

sin 20° ×cos ( 90°– 20°) + cos 20° × sin ( 90°–20°)......

= sin 20°×sin 20° + cos 20°× cos 20°

= sin²20° + cos² 20°

= 1

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