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00:00This is the most frequently asked question in Trikona Mithi.
00:03Usually, the answer is 1, but not in this case.
00:06What is the meaning of sin a plus sin square a is equal to 1?
00:08Tell me, which formula will be formed in cos?
00:10You will see, sir, sin a is equal to...
00:12If I take sin square there, 1 means sin square a.
00:14And what is 1 minus sin square a?
00:15It is cos square a.
00:17So, sin a is equal to cos square a.
00:19But in the question, it is asked that
00:21cos power is 4a plus cos power is 6a.
00:23This is power 2.
00:23cos square a is equal to sin a.
00:24So, what will be cos power 4a?
00:26cos power 4a will be sin square a.
00:28You tell me, what will be cos power 6a?
00:306a means cube of power 2, my friends.
00:312 or 6, sin cube a.
00:32So, sin cube a.
00:33Now, my dear friends,
00:34take sin a common from sin square a and sin cube a.
00:36Why did I take sin a common?
00:37You will see now.
00:38What will be left in the bracket?
00:39Sin a plus sin square a will be left.
00:41The interesting thing is that
00:42sin a plus sin square a is given as 1 in the question.
00:44That is, sin a is equal to 1.
00:45The answer to this question is, my friends,
00:47sin a is the c option.
00:48Do the second one and tell me.
00:49If you have learned it correctly, then lag it.