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2 cos 1/2 (30)×cos 1/2 (-10) + 2 cos 1/2 (90)×cos 1/2 (-10)
sin 15 + sin 45
-------------------
cos 15 + cos 45
sin (45-30) + sin 45
--------------------------
cos (45-30) + cos 45
sin45.cos30-cos45.sin30 + sin 45
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cos45.cos30-sin45.sin30 + cos45
1/2√2 . 1/2√3 - 1/2√2. 1/2 + 1/2√2
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1/2√2. 1/2√3 - 1/2√2. 1/2 + 1/2√2
1/4√6 - 1/4√2 + 1/2√2
------------------------------ = 1
1/4√6- 1/4√2 + 1/2√2